In July requested a contract to be cancelled

I went to MTN Head office Morningside to cancel my contract and the gentleman who was helping gave me a hos cellphone to call the call centre which was strange because they referred me to the branch. The same day 25th July 2015 instead of cancelling the contract it was upgraded to an open line.since July i have to Morningside branch several times ,called them so many times but no success. In November my contract was cancelled however there is a bill that is being owed as we speak i cannot make calls and don't have access to my data contract such an inconvenience.On Monday I went to MTN to resolve this issue .it was a waste of time .All I want is that MTN is to resolve my Issue and open my other contract. An urgent resolution will be appreciated .it has taken more than 5months to resolve and 4months to cancel my contract. I am extremely unhappy with the service if any ,i get calls from the callcentre and when i tell them my story no one calls back but quick send me to legal .