Mtn is Ripping me off

I Livhuwani Singo hade 3 contract with mtn and was very happy with it. so the problem started when have I made the upgrade on one of my numbers ***, the upgrade was a data sim contract My MTNChoice 40GB that was suppose to be R299.00 monthly. the upgrade was made on the 02/20/2021 by Angel Dube from the MTN store in Protea Gardens mall soweto Gauteng. i received the invoice on the 12/03/2021 and was charged too high when i asked they said it a Pro-rate charge, even though I was not happy with it i let it go,The following month I got charged the same amount. I called in customer care and was advice the contract is R890.40 monthly, when i asked was advice to go back to the point of sale, went to the store to ask about this was advice the person who assisted me no longer worked there, i asked the Mananger to cancel the upgrade because that was not the amount im willing to pay for the contract . The mananger tolled me i must come back to the store with the sim card, went back to the store now was given the run around.i called the call center they tryed to assist logging the ticket for me and to my suprise that was not all i was paying for, they have added services inever asked for 2x MTN self service data 1GB and 2x MTN self service 500MB. the Agent have tried to cancel it and logged ticket still there was no response on all my ticket . My account was handed over to legal beacuse was not paying my account because I was not getting any joy from mtn. MTN owe me and they expect me to pay when they dont want to cancel the mistake they have made. i have payed the amount that was owed on the contract now i want my refund for all the months i have to pay extra on this contract. mtn has wronged me in every way no customer it suppose to go through what i have went through. i want them to cancel this package and refund me on the money that have ****** from me.

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