*********** to cancel account

My mother cancelled her Telkom account on 2015-05-04 but up until today it is still not cancelled and they still send her accounts after she paid the outstanding amount as was indicated by the Telkom employee. the ref number for the cancellation was AI ***. I called this morning for assistance the operator cannot assist and when I ask to speak to a manager they tell me there is no Managers available. further more none of them can supply me with the details of the internal dispute resolution department details or the ombudsman.