7WEEKS later and my contract still isn't cancelled

I called MTN on the 7th of December 2015 to confirm that my contract was ending in December and I wanted to be switched to prepaid after the contract ended. I was told on the phone that day that it would take up to 7 working days for the switch to happen. <br> Nothing happened.<br> I then made a follow up call on 17 December, and I was told \there's a backlog and they will get to it". <br> Nothing happened.<br> I then made a THIRD call about it on 15 January 2016. I was again told that they would send a request to retentions and someone would get to it.<br> It's now been 7 WEEKS since I contacted MTN to get my contract cancelled"