Nightmare canceling contract - worst service from the worst mobile operator!!!!

I called the previous month of June to cancel my contract on the number *** with MTN as it was due to end. I was however offered a data contract package of 10GB of data per month for R79, I was then told by the lady from MTN that my contract had now been downgraded. I then never heard anything or never received communication until I decided to call today to find out if my new contract had been activated, however was told that it is still pending (Lord knows why)...

Adding to the pain of having to hold for long minutes to get through to an operator I was told that I would be contacted back telephonically within a few minutes back by some mystery lady from the sales team (Which was a lie because nobody contacted me).

I need to know if my contract has been canceled/downgraded or not because come due date of the debit and I'm being over-debited I'll drive to your offices if I have to and get my money back....I'm sick and tired of MTN's pathetic customer service. You call yourselves a leading mobile service provider but you are actually the WORST!!!!