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 nad yw’r cod hwn gennych, ffoniwch y Ganolfan Gyswllt i Gwsmeriaid ar 0300 062 5004 (dydd Llun i ddydd Iau 8.30am – 5pm, dydd Gwener 8.30am – 4.30pm) a dweud wrth y cysylltydd beth yw’ch CRN.