Cancellation of cell phone contract

I have cancelled my cell phone contract which is out of the contract period on 26 November 2015. When I want to port my number to a new cell phone company they informed me that my contract is not cancelled with Telkom Mobile. On 2 January 2016 I visited a Telkom Mobile shop and they informed me even if you have signed a cancellation form a consultant must phone you to confirm the cancellation. A consultant has phoned me on 22 December 2015, however I could not speak to him as I was driving, the consultant just cancelled my cancellation. I am now waiting from 2 January that a consultant phone me again to confirm the cancellation. I missed a call from them yesterday, and nobody has phoned me again. The consultant at the Telkom Mobile shop this morning could not assist me to confirm the cancellation. However it is not clear why must a consultant confirm my cancellation, the form that I have signed is evidence enough that I want to cancel. If this is how Telkom Mobile want to retain customers they have just made sure that I will never use them again.