Cancellation not completed

Good day. I would like to complain about the service I have received at Autopage cellular. I placed a cancellation order my 3G contract in November last year and was promised that when the contract expires in December 2014 (last year), I would stop getting billed. I was billed again in January and February, so I phoned the cancellation department and once again placed a cancellation order. I was told that I would no longer be billed and that I would be refunded for the months which I have not used the data. THE CONTRACT WAS STILL NOT CANCELLED. I went into the branch at Menlyn and asked, once again, for the contract to be cancelled. I was phoned last month (May) and told that it had been cancelled, but once again, I was billed again this month! I did not want to stop the debit order and get a bad credit rating, but this is ridiculous. I want to be refunded for all the months that I have not used the data and for the contract to be cancelled once and for all.