Still waiting for a response... After 7 months!!

Disgusting. Thats one of the words I can think of to describe MTN. I cancelled my contract with MTN on the 25th April 2017. A month later I still owed them money even though the contract was cancelled and What was due to them which was presented to me in the form of a cancellation letter. The consultant that assisted me is Nokukhanya Motiang and couldnt give me a valid reason as to why i still owed money for data charges even though the cellphone number in question became a prepaid number 24hrs after i paid the cancellation amount. I recently discovered that I am on ITC for this reason and I have contacted MTN several times telling me that the legal dept will get back to me as I am willing to settle this amount so that I can have my clear credit score back. I have 2 reference numbers but still no call back. Also I didnt recieve any notification from any lawyer stating that this is what I owe. Its all a **** to add interest onto whats owing and R100 can go to R500 just because they dont inform you. The latest ref I got from MTN to say the legal dept will call is 261677 054. Can someone please assist so I can rid these people from my life.