Regulators, ombudsmen and scam services
CISAS phone numbers
Edited by Richard BarkerChecked 14 October 2026
CISAS publishes 1 number for you to call on its own website. We list each one with the page it is on (1 page in all), a short quote from that page and the date we checked it.
Numbers to call CISAS
What each line is for, as CISAS describes it, with opening hours where it gives them.
- 020 7520 3814
You call them on this number
Phone and broadband complaints and enquiries
Source: “020 7520 3814 cisas@cedr.com” (opens in a new tab). Checked 14 October 2026.
How scams that copy regulators, ombudsmen and scam services work
Ofgem warns that scammers pretend to be from Ofgem, and says it will never sell you energy, ask for your bank details or come to your home. The FCA says pension scams often start with attractive offers to transfer or release your pension.
Ofcom says scammers can fake the number that appears on your phone, which is called spoofing, and that they imitate UK numbers to look like a trusted person or organisation. Knowing details about you does not make a caller genuine.
This could still be a scam call
Criminals can make their number look like a genuine one (this is called spoofing). If someone calls from this number and asks for money, bank details, a code or passwords, hang up. Then call CISAS back on a number you've found yourself, such as the one on their own website or on a letter or bill from them.
Safe ways to check
- CISAS's own contact page (opens in a new tab): Where this number is published.
- Report Fraud (opens in a new tab): Report fraud and cyber crime in England, Wales and Northern Ireland. In Scotland, call Police Scotland on 101.
- Forward scam texts to 7726 (opens in a new tab): It is free, and reports the message to your mobile provider.
- How number spoofing works: Why a genuine number on your screen does not prove who is calling.
Questions about CISAS’s numbers
What numbers can I call CISAS on?
CISAS publishes 1 number for the public to call. They are: 020 7520 3814 (Phone and broadband complaints and enquiries). Check the source page for each one before you call, as numbers and opening hours change.
Does CISAS publish a number on its own website that is not listed here? Suggest a number for CISAS.
Sources and checks
This page relies on:
Checked on 14 October 2026. Read how we build the directory. How we check our information. Spotted a mistake? Tell us and we will put it right.