MTN debiting off account after cancellation

I phoned MTN on 18 June 2015 to give 2 months notice to cancel my contract with them. They told me it would be cancelled at the end of the contract in 2 months time. MTN requires you to give 2 months cancellation notice which I have done yet they are still deducting off my account 4 months later. I phoned another 2 times after each debit order went off incorrectly and I was told that they would send an email to follow up with cancellations and they will get back to me. I still have not heard anything. I have phoned once again now and was told the same story. I want the account cancelled and closed by End of Business today and I want the money refunded to me today as well. If the Debit order goes off my account again this month that is 3 months of debit orders to be refunded for. This is absolutely pathetic service and it is actually theft. The 3 reference numbers for the calls are: *** & *** & ***. I expect this to be resolved immediately!