Monmouthshire Building Society
This number is listed by Monmouthshire Building Society on its own website (Savings and mortgage customer services).
- Hours:
- Weekdays 9am to 5pm, Wednesday 10am to 5pm
Source: “Getting in touch with our Customer Services team on 01633 844 340” (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 Monmouthshire Building Society back on the number on the back of your card, or call 159, which connects you to your bank.