National Benefit Fraud Hotline, Monday to Friday, 8.00am to 6.00pm on 0800 854 440, they also have a dedicated Welsh hotline on 0800 678 3722.
Llinell Gymorth Twyll Budd-daliadau Genedlaethol (NBFH), dydd Llun i ddydd Gwener, 8.00am tan 6.00pm ar 0800 854 440, mae ganddynt hefyd linell gymorth iaith Gymraeg benodol ar 0800 678 3722.