cancelled contract still going strong

January of this year i did a early cancellation at Mtn. I paid all the fees that needed to be paid and i was told that the contract is now stopped. 2 months went by until yesterday mtn started billing me again. I went to my closest Mtn shop and they told me that the contract is still running and my cancellation fees which i paid has been used to pay for 2 months subscription. I stay on the line all day and dont get thru to anyone at the call centre. the one time when i did speak to a consultant he just decided to end the call after talking to him for a few minutes. i am just gonna get my legal team to sort this out, doesnt help for a consumer like me to even try and sort this out which is not even my fault.