Telkom *******ly billing me

Telkom has blacklisted me for an account that was canceled 2 years ago. I got a cancelation number from them ***A. Then they kept on billing me so i had to dispute it with dispute number TFLSN11335 this dispute was on 25/06/2019, they waved all the fees because they found that it was their error. I also spoke to someone named Asanda Scout who gave me a reference number ***4. When i went to the bank to apply for a home loan they turned me down saying that telkom blacklisted me. The way telkom works is that they wont cancel your account unless it is fully paid up so if i have a cancellation number then obviously my account must be paid up but this doesnt seem to be sinple enough for them to understand so does anyone know what i can do to fix this