Failure To Cancel Service

December 2016 is when i cancelled my contract with Telkom, doing it by the book it might add, filling out the correct documents, allowing for the correct notice period etc.

Its now August 2017 and apparently a part of my service has still not been cancelled, i still receive an invoice from Telkom for a service I no longer use. I have been harassed by a collecting company month after month and whenever I try and resolve the issue they tell me a ticket has been issued on my account, WHAT ACCOUNT!? and why hasn't this been resolved? They tell me that the individual who was supposed to cancel my entire account did not cancel the line rental, how is that my fault?

Telkom has the monopoly when it comes to internet providers but how can this not be resolved?

Telkom sort this out now before I reach out to the press!!