How to complain to O2 UK.

Type: Telecom
Region: UK
Escalate to: CISAS (Communications and Internet Services Adjudication Scheme)
Response deadline: 8 weeks (or a deadlock letter sooner) before you can escalate to CISAS

Details checked 2026-06-02

O2 (Virgin Media O2) is a member of CISAS, not the Communications Ombudsman.

Complain to O2 UK first and ask for a written final response. If they reject you or the deadline passes, you can take it to the CISAS (Communications and Internet Services Adjudication Scheme) for free, and their decision is binding on the company.

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Details compiled for convenience. Always confirm the current contact on O2 UK's own site. A self-serve tool, not a law firm. Not legal advice.