Desperate customer trying to cancel Telkom service since January

I have been trying since January 2017 to cancel my Telkom landline and ADSL services but to no avail. I followed all the correct processes and filled the right cancellation document and Telkom have receipt of my request. But no matter how many calls to Telkom, they simply are unable or even scarier unwilling to cancel my service. Who can help me or advise me as I am not sure who to turn to resolve this billing matter. Every time I phone their call center, I speak to a different person and have to explain the entire story. They say that it was supposed to be processed by a certain agent who processed the cancellation order but nobody is prepared to take accountability. Is there a complaints section that I can escalate as this is really giving a terrible impression of Telkom.