Cynergy Bank
This number is listed by Cynergy Bank on its own website as a number it may call you from (Customer services call back).
Source: “+44 20 3901 7531 or +44 20 3892 4149.” (opens in a new tab). Checked 14 October 2026.
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 Cynergy Bank back on the number on the back of your card, or call 159, which connects you to your bank.