6 Months and still no service cancellation!!

I have unsuccessfully been trying to cancel my later Grandfather's telephone account with Telkom since February 2018. I have sent the cancellations forms through several times. One of the consultants asked me too email her the documents which I did 3 times and we are still receiving bills. I spoke to a rude *********** man this morning that is not a South African and he refused to put me through to his supervisor. He said all the managers were in meetings. I am very disappointing at the level of service from Telkom. One has to hold on for a half an hour before the call is answered and then speak to someone who does not have a clue of what he is doing. How can ANY business operate like this!! Shocking!!