charged yet no contract

I had 2contracts with mtn R159 and R199 i cancelled thr last contract last month after a back and forth as no one could advise me when to submit my cancellation<br> The R159 was cancelled months ago and changed to prepaid and yet I see on my recent statement I have been billed R159! For what? I never received airtime o. either excontracts last month so can someone please have the logic to explain this to me! This is ******* that MTN is billing people for no reason.<br> I last cancelled my contract Of R199 at parowcentre and even faxed through the confirmation to your customercare. Not only was the girl at that branch THE most unpleasant person to deal with, Noone had the decency to reply and acknowledge my email and now after more than 40days mtn wants to bill me, you got to be joking<br> if i dont get my money back into my bank account im taking legal action soonest!!!!