Overcharged. Suspended, Incompetence.

I had 4 mobile contracts with Telkom. I gave a month's notice on 3 Nov '15 to terminate end Nov '15. This notice was given on their cancellation form, and emailed together with my ID. At the end of November these contracts were not cancelled. Apparently they tried to call me but had no reply, so cancellation did not proceed?! Nowhere on their cancellation form does it say that a phone call from them is necessary for cancellation. So the bill included full charges for the two devices that I had cancelled. The debit order was too high, and it bounced. I went into the Telkom Somerset West office but a sign on the door says \this office does not deal with account enquiries please call 10210". Over the next two months I consistently phoned Telkom customer service for mobile"