Free Complaint Letter Templates
Ready-to-use, copy-and-paste templates for raising and escalating a complaint about O2 (and Vodafone)
Before You Start: The 4-Step Escalation Ladder
- Formal complaint to O2 (Template 1). Gives O2 the chance to resolve.
- Request a deadlock letter (Template 2) if O2 won’t resolve. This unlocks immediate ADR access.
- Submit to Ombudsman Services: Communications (Template 3) — O2’s free, Ofcom-approved adjudicator.
- If you are with Vodafone, submit to CISAS instead (Template 4).
You cannot go to ADR until you have either (a) a deadlock letter, or (b) 8 weeks of an unresolved formal complaint. Detail on the ADR schemes: CISAS vs Ombudsman Services: which ADR handles your provider?
Template 1 — Formal Complaint to O2
When to use: You’ve already tried O2 customer service and the issue is not resolved. This is the written formal complaint that starts the 8-week clock.
Send to: O2 Complaints Review Service, PO Box 694, Winchester, SO23 5AP. Or via O2’s online complaints form at o2.co.uk.
[YOUR FULL NAME]
[YOUR ADDRESS]
[POSTCODE]
O2 Complaints Review Service
PO Box 694
Winchester SO23 5AP
[DATE]
Formal complaint — account [YOUR O2 ACCOUNT NUMBER]
Dear Sir or Madam,
I am writing to raise a formal complaint about the O2 service on my account [ACCOUNT NUMBER / MOBILE NUMBER].
What has happened. [IN 2–4 SENTENCES, SET OUT THE FACTS. DATES. AMOUNTS. WHAT WAS PROMISED VERSUS WHAT WAS DELIVERED. KEEP IT CLEAR AND UNEMOTIONAL.]
What I have already tried. [LIST PREVIOUS CONTACTS WITH O2: DATE, CHANNEL (PHONE 202 / LIVE CHAT / IN-STORE), NAME OF ADVISOR IF KNOWN, REFERENCE NUMBER, WHAT WAS SAID.]
Why I believe this is wrong. [REFERENCE THE RELEVANT RULE. EXAMPLES: “Under Ofcom General Condition C1, the price of the contract was to be [£X]; the charges on my bill exceed that.” / “Under the Consumer Rights Act 2015, services must be provided with reasonable care and skill, and the coverage at my address has been unusable since [DATE].”]
What I want. [BE SPECIFIC. EXAMPLES: A REFUND OF £[X]. REMOVAL OF A CHARGE. RELEASE FROM THE CONTRACT WITHOUT EARLY TERMINATION FEES. A WRITTEN APOLOGY AND A £[X] GOODWILL PAYMENT.]
I would be grateful for a full written response within 14 working days. If this complaint is not resolved within 8 weeks, or if O2 issues a deadlock letter, I reserve the right to escalate to Ombudsman Services: Communications, O2’s Ofcom-approved Alternative Dispute Resolution scheme.
Attached please find: [LIST EVIDENCE — COPIES OF BILLS, SCREENSHOTS, EMAILS, CHAT TRANSCRIPTS].
Yours faithfully,
[YOUR FULL NAME]
[YOUR PHONE NUMBER]
[YOUR EMAIL]
Template 2 — Request for a Deadlock Letter
When to use: You’ve raised a formal complaint, O2 has replied with a final position you reject, and you want to go to the Ombudsman now rather than wait out the full 8 weeks. Ask for a deadlock letter in writing.
Send to: Same address as Template 1, or via the O2 complaints channel that responded to you.
[YOUR NAME AND ADDRESS]
O2 Complaints Review Service
PO Box 694, Winchester SO23 5AP
[DATE]
Request for deadlock letter — account [ACCOUNT NUMBER], complaint reference [REF]
Dear Sir or Madam,
I refer to my formal complaint of [DATE], reference [COMPLAINT REF], and to your response dated [DATE OF O2’S FINAL REPLY].
I reject your proposed resolution for the reasons set out in my original complaint. Since we have reached a final position, I consider this complaint to be at deadlock.
Please issue a written deadlock letter confirming that O2 will take the matter no further, so I may refer the dispute to Ombudsman Services: Communications (O2’s Ofcom-approved ADR scheme) without waiting for the 8-week period to elapse.
Please confirm by [DATE + 14 DAYS].
Yours faithfully,
[YOUR FULL NAME]
Template 3 — Submission to Ombudsman Services: Communications (O2, EE, BT, Three, Sky)
When to use: Either 8 weeks have passed since your formal complaint, or O2 has sent you a deadlock letter. You file online at ombudsman-services.org/sectors/communications. The form asks for the facts and evidence — paste the text below into their narrative field (or attach as a PDF).
Summary of complaint
Provider: O2 (Telefónica UK Limited / Virgin Media O2).
Account number: [ACCOUNT NUMBER]
Mobile number affected: [NUMBER]
What happened. [2–4 SENTENCE FACT SUMMARY. DATES. AMOUNTS.]
Timeline of previous contacts with O2. [LIST IN DATE ORDER WITH REF NUMBERS AND OUTCOMES.]
Formal complaint details. I raised a formal complaint in writing on [DATE] (reference [REF]). [STATE THE OUTCOME: O2 RESPONDED ON [DATE] WITH [POSITION] / 8 WEEKS HAVE PASSED WITHOUT RESOLUTION / O2 ISSUED A DEADLOCK LETTER ON [DATE] (ATTACHED).]
Why O2 has failed to resolve this fairly. [REFERENCE THE SPECIFIC RULE: OFCOM GC C1 ON TRANSPARENCY, GC C4 ON TEXT-TO-SWITCH, GC C5 ON COMPLAINTS HANDLING, OR THE CONSUMER RIGHTS ACT 2015 PROVISION RELEVANT TO YOUR CASE.]
The resolution I am seeking. [SPECIFIC AMOUNT / CONTRACT CHANGE / COMPENSATION. BE PRECISE.]
Evidence attached. Copies of: [BILLS / CORRESPONDENCE / SCREENSHOTS / O2’S WRITTEN RESPONSE / DEADLOCK LETTER].
I confirm I have given O2 the opportunity to resolve this complaint before approaching Ombudsman Services.
Template 4 — Submission to CISAS (Vodafone Customers)
When to use: You are a Vodafone customer (including VOXI) and the dispute is unresolved. CISAS is Vodafone’s Ofcom-approved ADR scheme — not Ombudsman Services. File at cedr.com/consumer/cisas. Paste the text below into the CISAS form.
Summary of complaint
Provider: Vodafone UK.
Account number: [ACCOUNT NUMBER]
Mobile number affected: [NUMBER]
What happened. [FACT SUMMARY.]
Contacts with Vodafone. [DATES, REF NUMBERS, WHAT WAS SAID.]
Formal complaint. Raised on [DATE]. [OUTCOME: VODAFONE RESPONDED ON [DATE] WITH [POSITION] / 8 WEEKS HAVE PASSED / DEADLOCK LETTER ISSUED ON [DATE] (ATTACHED).]
Why Vodafone has failed to resolve fairly. [SPECIFIC OFCOM GC OR CRA 2015 REFERENCE.]
Resolution sought. [PRECISE AMOUNT / REMEDY.]
Evidence attached. [LIST.]
I confirm I have given Vodafone the chance to resolve this complaint before approaching CISAS.
Tips for a Strong Complaint
- Write, don’t call. Phone complaints vanish into thin air. Written complaints create a paper trail.
- Be specific about the remedy. “Refund £42.50 on my May bill” beats “I want my money back”.
- Reference the rule. Quote the Ofcom General Condition or the Consumer Rights Act. It signals that you know your rights.
- Set a deadline. 14 days for a simple case, longer for complex ones.
- Keep a copy of everything. Dates, references, advisor names, your sent letters.
- Don’t stop paying. If you dispute a charge, pay it under protest and pursue a refund. Non-payment risks a credit default.
Useful Reading
- Ofcom General Conditions Explained — the statutory rulebook every UK mobile provider must follow.
- CISAS vs Ombudsman Services — which adjudicator handles your provider.
- O2 complaints process, step by step.
- How to complain about EE.
- How to complain about Vodafone.
- How to complain about Three UK.
Need a Second Pair of Eyes on Your Complaint?
The free advocacy helpline will read your draft with you and point out anything missing — no charge, we never ask for your O2 login, calls recorded for training.
These templates are general consumer-advocacy guidance, not regulated legal advice. For regulated legal advice, consult Citizens Advice (free) or a solicitor regulated by the SRA. 02 Helpdesk is operated by Sami Ibrahim as a sole trader; it is NOT affiliated with O2, Virgin Media O2, or Telefónica UK Ltd.