Cancelled service in 2015 but still being billed!!

So i cancelled my contract in November 2015 and up to now am still being billed. Every week i have to contact the call center to complain without any success. I have emails from Telkom apologizing but still i am being billed. When i cancelled i was told it will be cancelled in 20 working days but its now over 100 days!! Spoke to Hophne and Josephine from the call center and they are now telling me that turnaround time for a case is 72 business days.,..Is thi some kind of sick joke?? Another 3 months of being billed. I want my refund and this contract cancelled please. Good thing for this month my bank has managed to reverse the payment but this is **** service from telkom. How complicated is it to just cancel and account and reverse my money!! Someone at telkom please assist. Spoke to Hophne from the call center on Monday and he said he couldn't assist me due to a system fault but would phone me back and now its Thursday and i have had to call again!!