Contract cancelled but still getting charged

<p>I took out a data contract in May 2014 and after 24 months cancelled it. For the last two months I have still been debited for more than the original contract amount. The sim was removed from the device as I had got another pay as you go card.</p> <p>when I called to query why I was still getting billed and at a higher rate I was told that I had received an upgrade ,after explaining the I have not upgraded my account or received a new device I was told that I must get an affidavit stating that I had not received the upgrade so that it could be investigated.</p> <p>why can't mtn go check and see where my supposed upgrade was done or where all the documents are? </p> <p>I don't have the time to go running around because mtn has no clue what they have done , they are only cared that they get their debit order and ****** the customer.</p> <p>i will never support mtn again and will actively discourage anyone from doing so.</p>