If you're unhappy with a CMC's response to your complaint, get in touch with us.

Service update in light of the Covid-19 (coronavirus) outbreak

Bank holiday service

Our phone lines and social media inboxes will be closed from 5pm on Friday 22 May and will open again on Tuesday 26 May, at 8am.

  • We may at times have limited availability on our phone lines. Where possible, please email us or make a complaint online.  
  • For the safety of our staff, and in line with government guidance, we have limited access to our office. While we are currently able to open post, this is not guaranteed and there will be delays in processing this. So please only send us post if you cannot contact us by phone, online or by email. 
  • We won’t be able to contact you if we don’t have your email address or phone number. So please get in touch with us if we normally correspond with you in writing – and you haven’t previously given us any other means of contacting you.  
  • If your complaint has been allocated and you have the contact details of the case handler, you can still contact them directly.

Find out more about our approach to complaints that might be caused or affected by Covid-19.


  • Get in touch online

    To register a new complaint, use our online forms.

    Complain online 

  • Send us an email

    To contact us about an existing case, send us an email quoting your case reference number. Please bear with us, it might take us a little longer to respond at the moment.

    Email us 

  • Call us

    Our phones lines are open, with limited availability, between 8am and 5pm. It's possible that you may have to wait to speak to someone.  

    Please only call us at this time if you are facing severe ill-health or financial hardship.

    Call us 

Woman talking on the phone at her desk with others around her working on laptops

Our technical desk

Businesses and people involved in responding to complaints can contact our technical desk for help with general enquiries.

If you are a business and are looking for guidance, our technical desk is still open but with reduced hours while we get used to working differently. The lines are open Monday to Friday, inclusive, between 9.30am and 4pm. Alternatively, please contact the technical desk by email or, if you have a query about our approach to complaints caused or affected by Covid-19, read our information for businesses.

0207 964 1400

Find out more