Telkom line cancellation

I am appalled with the service I have received from Telkom. I have tried to cancel my Telkom landline subscription since December 2020. Every time I call I am given a reference number, the subscription costs on my account are then reversed when they acknowledge my cancellatiin request. I have once again received an account for June 2021. I have 3 reference numbers for very time I have called in and requested the cancelation. My credit profile has been impacted as it is reflecting that I have not paid my account. I want to know what I can do to cancel as I have called to cancel and I have cancelled on the Telkom site on 2 occasions. I have stopped using the landline since I have Fibre. Telkom you are holding me hostage.