Telkom Cancellation Headache

On the 2 February 2018 I canceled my Telkom Line and ADSL due to Telkom not replacing cables that had been ****** twice in one month (January), Telkom then informed us that they will not be replacing the cables as this is to costly which I understand. This was my only reason for cancelling. I received confirmation on the 8 February that the cancellation form had been received but have still been billed for a service I no longer have. I have spoken to a number of service agents and have received references hopping to get closer but to no avail. I have now been handed over to a collection company for outstanding moneys owed. When I ask to speak to a manager they are never available. Please can someone come back to me so that this can be resolved asap