Cansellation of contract

On 15/10/2015 I enquired (via e-mail) about the remaining term of one of my contracts with MTN. I received confirmation that the date of termination will be 17/01/2016 and that 30 day notice was required for cancelation. On 25/11/2015 notice was given in respect of the cancelation, I received a standardized email the same day confusing the one contract with the other. On 25/11/2015 I responded and corrected the error. On 2/12/2015 and 19/01/2016 I requested acknowledgement of my correspondence and cancellation request. On 26/01/2016 I was required to provide personal information for security reasons in order to cancel the contract, which was provided the following day. On 15/02/2016 I again enquired about my request, I received a reply the same day informing me that the request was escalated to the Retention department. I just received the Feb 2016 statement just to find that the contract is still active, hopefully my final attempt will be successful. I might have better success when cancelling my remaining contract in Dec 2016.