Held financially hostage for 3 years and counting.

I have been in the process of cancelling my account account for 3 years now. I no longer live at the residence it is even registered to anymore...

I have called their support line. I have been into stores. I have spoken with countless people. I have emails. I have jumped through every hoop they have given me. I am now at line cancellation confirmation 3 where I have been completely assured that the account has been credited and it is FINALLY cancelled this time. I have cancellation confirmation emails even... BUT STILL... the account stays open, they add to the bill every month and now I have a Law firm sending me emails to make these payments.

I am beyond tired of fighting with Telkom on this. I have been held financially hostage for 3. THREE! Years now. I am at a stage now where I'm hesitant to even pay the account, though I am not liable to do so because this is Telkom's mess and then cancel it because they will just bill me again next month......

What else can I do? Sue them? Is that what it takes to get a line cancelled in 2019? Just tell me what the hell I need to do and I will do it... and dont tell me to pay the account and then cancel, because I have been creditted to 0 three times in the last year, only for the line to start gathering charges again, so paying them at this point is not even a fix.