Never take MTN contract. Worst service from MTN

I am never taking any MTN contract no more.. Worst experience with MTN South Africa. Such *********** customer service consultants. I had 3 year contract with MTN that has expired on 11 September 2025. MTN billed me on 12 September for standard package of R2119. I was told it’s now month to month billing. From 13 September I have been calling MTN 135 to clarify this, I was told invoice hasn’t been generated yet I must call back once I receive an invoice. Finally I received email and I queried with them it took days, on 18 September I told them to cancel this contract. On 12 October they billed me again for R2119. I asked but are you guys still billing me when I have not even used your service. They keep telling me due to billing circle and they bill me a month in arrears. How is this a month in arrears billing when you are billing me a full month charge and worst I have cancelled the contract, then I told them, this is an advance billing, and why do you bill me a full month already when my contract is effectively cancelled on 18 October. They said no this is a month in arrears. But MTN provisioned the data for period 12 October to 11 November. I’m like this is bull****. All their consultants say different things. So very ***********, they can’t answer questions. Why are they for????