Contract Cancellation Is Impossible

So, I have been a loyal MTN customer from way back in 2005. I currently have 4 contracts with them for various family members. One of these contracts was due to expire at the end of January 2015. Knowing the rules, I emailed MTN on 3 December 2014, notifying them of my intention to cancel the contract at the end of its term. I then followed up with another email on 2 January 2015, asking them to confirm that the cancellation order has been put in place. This was then followed up with a call to their customer call centre a few days later, when I was told to call back on 2 Feb to get final confirmation that the contract has been cancelled. Having had a hectic day on the 2nd, I made the call now on 3 Feb, only to be told that the contract has not yet been cancelled, even though there is a trail on the system of the request. I dare MTN to tell me that I have to fork out for another months subscription on this number, as I have followed the requirements of the contract and provided MTN with at least 30 days notice of the intended cancellation of the contract, as stipulated by the the contract itself