Telkom

I have two accounts with Telkom. I went to their store mall of the North Polokwane to change the banking details, the lady changed the banking details for only one account. Now Telkom charged me R202 penalty fee for getting their payment because they debited in the old account of which there was no money, and the bank charged me penalty fee of R147. I have tried to call them to resolve the problem but no one is assisting me. When I call their customer care they refer me back to the store of which I don't get assistance. Now they are threatening block the service and blacklist me for the R202 that I have reversed because it was not my fault. Hello Peter can you kindly assist me because this is frustrating me.