Failure to cancel Contracts after 24 months

I had opened a mobile contract with Telkom Mobile will expires on the 7 November 2015. I have sent Telkom my cancellation latter on email and i even made an initiative to go to their store to submit my documents.<br> <br> the contract is still not cancelled, i have called on numerous occasions get the line closed with no luck. I have spoken to a number of managers Tumi Madisha and Melissa Hamburg with promised that the matter will be escalated to the cancellations department, but still no luck. i got a mobile bill for R752.00 for a cellphone contract i have cancelled way in advance but all i get told is they will cancel the contract which they never manage to do.<br> <br> Please help.