Incorrect Billing. Inability to cancel Contract

My probelem began Novemebr 2015. I sent via email the form to cancel my contract as my contract period had ended and I wanted to move to a prepaid structure and receive no billing whatsoever from Telkom. I even spoke to an agent about this but still no correct action.<br> My bank account was debited with a high incorrect amount for my billing even after requesting to move to prepaid and asking the credit to be passed to my bank account and not telkom account. Yet it was passed to my Telkom account which I have no use for as my contract term has ended.<br> In December 2015 and now January 2016 I am yet to receive resolution of incorrect billing and my requring credit to my bank account of the incorrectly debited money as well as move to prepaid structure. Only case number after case number I have received and no resolution.<br> I want the incorrectly debited money back into my bank account and I want to be moved to a prepaid structure not contract profile anymore. I have no contract anymore and do not want an upgrade of any sort.