MTN Contract phone and removal from credit bureau

My contract phone with MTN expired on the 18/07/2022 and I called them a month before and told them that I will not be renewing it. The consultant did not cancel on the system, instead he renew the contract I do not why and how. A month after a tele agent called me and sold me a data contract on the same number as a new contract for R99 a month and I took it as a new contract because I knew i did not renew my contract. The 15/08/2022 my account was billed by MTN FOR R551 and I was shocked and returned the debit order. So was September and October and also reversed. I have been calling customer since August 2022 to date 16 January 2023 and been sent from pillar to post and the worst part they put my name credit bureau while my case is still with them. I called today again and was assisted by a rude lady called Nomveliso, she said they are not allowed to give out their surnames and they do not have supervisors nor managers and then hung up the phone on me. customer care agents are not assisting at even when calling them. I need my name to be removed from the credit bureau as it is affecting my name. hellopeter kindly assist me , im frustrated.