Telkom help me cancel my line. Credit bureau has black listed me because of your incompetence

Hello Telkom

I have tried since March 2018 to cancel my Telkom line. I paid for my Telkom line until April 2018 I have reference numbers for my cancellation application from Telkom online since March 2018

to date my Telkom account has not been cancelled. I have logged dispute after dispute because I keep getting invoiced, the amount outstanding is huge.

now I get notice that I am black listed by the credit bureau because of arrears on my Telkom account, this is unacceptable because of Telkom incompetence to cancel my line, my account is in arrears and I have been black listed.

Telkom is the most pathetic provider. I am logging yet another dispute. this issue is so old that when I call Telkom, they have to goto their Archives to search for the data. People on the call centre are very helpful in trying to assist me. but they cannot do anything except for escalating this issue, but it never gets resolved.

pls help me