If you're unhappy with a CMC's response to your complaint, get in touch with us.
Get in touch by phone
Call our consumer helpline:
- 0800 023 4567 (free to call on mobiles or landlines)
- (18002) 020 7964 1000 (calls using next generation text relay)
- +44 207 964 1000 (if you're calling from abroad)
Get in touch online
You can tell us about your complaint online
Get in touch by post
Exchange Tower, Harbour Exchange, London, E14 9SR
CMC complaint form (PDF)
Get in touch by text
Text us on 07860 027 586
Please don't send any account numbers or bank details by text, we'll sort that out later. Text messages will be charged at your network's standard rate.
Our business advice desk
If you're a CMC business and you'd like to speak to us, you can contact our business advice desk.