Doubled charged for an expired contract

In September 2015 I visited a Telkom branch and filled in a cancellation form to cancel my contract, it has reached the end of its 24 Month period. I have called the call centre countless times spoke to various people, including managers and supervisors, been given different case numbers. Yet my contract is still not cancelled. I have emailed Telkom with the whole story over and over. It is December 2015 and my contract is still not cancelled. I have visited the store again and they resent the cancellation form for me and indicated they will call me back. Its more than 2 months later and the contract is still not cancelled. I was billed double for November and I was billed for October as well and the contract was supposed to end October 2015 already. I never used the data on the contract, as I said I want it cancelled. I can't get anywhere with Telkom. I want to be credited for Oct and Nov 2015 and I want the contract to be cancelled, as I have proof that I cancelled this contract in September 2015 already. <br> The latest reference number that I received is ***9. Please sort this out. I do not want the contract! I want my refund. I have no idea where to go from here.