Telkom billing faults

After failing to refund me all the money they owed me, as I had laid a complaint through ICASA, these people still try to debit my account for a cancelation fee. They keep sending me an invoice and deducting on my account. I had to have the bank reverse and stop future payments. These people had one simple task. To refund me then we continue with business as normal. Instead they decided not to. I have incurred additional charges because of them trying to deduct money from my account. The lady I spoke to from ICASA confirmed that they are not supposed to be wanting a cancelation fee whereas they were the ones at fault.