BAD CUSTOMER SERVICE

I called MTN and spoke to a lady called Lerato at MTN collections department and she hung up on me because she could not answer my questions regarding the month to month sim only contract which I cancelled a month ago. I followed their instructions on cancelling the contract way before they load my data and now I received an invoice indicating that I will be debited in November, when I ask how is that possible, Lerato decides to hang up on me. But rest assured, should I get that debit order I will gladly dispute it and block it as well.