MTN making it horrible for me to stop a contract that’s ended 😡

I took a 24 months contract with Mtn that ended in Feb. The contract was R299 monthly. Not once in those 2 years have I missed a payment!! So it turns when the contract ends you are put on a month contract which makes sense until you cancel it. I called in on the 03/03/2022 to cancel and they said because I receive the data on the 27th of each month I can use the data and call in before the 15th of March. I called today the 11/03/2022. I’ve spoken to over 12 different people who were rude, not willing to help, speaking over me and some even hung up the phone on me. I’ve been on the phone for over 2 hours and no one is willing to help me. All I wanted to do was stop the month to month, I am aware that end of March I will be billed R561 which is the price for the month to month. All the agents including the managers I’ve requested cannot confirm and email me that my contact is canceled and I will stop receiving data and the March amount is the last debit. What’s disappointing is I’m incorrectly advised by different people, none of the managers are escalating my issue as promised, the agents use vulgar language to talk to me. Never signing up to anything with MTN EVER…….