If you consider that your personal data has been misused or mishandled, you may make a complaint to the Information Commissioner, who is an independent regulator.
Os ydych chi’n credu bod eich data personol wedi cael ei gamddefnyddio neu ei gam-drafod, gallwch chi gwyno wrth y Comisiynydd Gwybodaeth, sy’n rheoleiddiwr annibynnol.