In some circumstances we can recover an overpayment from the landlord, but only if we consider the landlord knew about the change and did not tell us.
Dan rai amgylchiadau gallwn adennill y gordaliad oddi wrth y landlord, ond dim ond os ydym o’r farn bod y landlord yn gwybod am y newid a heb roi gwybod i ni amdano.