MTN FAILING to return money owed

I cancelled my tablet contract in April 2015 (taking into account a 1 month notice period) as my contract was expiring in May 2015.<br> <br> After 6 months, Mtn is still deducting monthly payments from my bank account after numerous calls to there accounts department.<br> After my first call in September I was advised that the debit order has been cancelled and my money would be credited back into my account within 21 days (now another 3 mtns later).<br> <br> I made two follow-up calls and the same story was told.<br> Today I called once again and the operator just hung up the phone on me.<br> <br> Mtn has now deducted 6 months of payments from my account with no sign of crediting the money back into my account. Thus *****ING from previous clients of theirs and not attempting to rectify it.<br> When I call, I get the same story every time with empty promises that my money will be returned and now... agents hanging up on me!!<br> <br> Can someone please give me the details of someone that can actually be of help as the call centre agents are USELESS!!!<br> <br> I want my money back ASAP!!!!!<br>