If you no longer have this, please telephone the Customer Contact Centre on 0300 062 5004 (Monday – Thursday 8:30 – 17:00, Friday 8:30 – 16:30) and tell the operator your CRN.
Os ydych wedi’i golli, ffoniwch y Ganolfan Gyswllt i Gwsmeriaid ar 0300 062 5004 (Llun i Iau 8.30am i 5pm, Gwener 8.30am i 4.30pm) a rhoi eich CRN i’r cysylltydd.