MTN thieving extra fees to a pensioner now that contract completed

Good day my name is Maureen Adams mobile *** which belongs to my daughter. My contract has recently completed the 2 year period and on 17 May 2023 i received an SMS to inform that my contract is changing from R173-04 to R206.957??? Today i spoke to Sange Nkosi Ref ***, who informed that my payment is now R797-00, which is so annoying as i paid R370-00 each month for the duration of this contract prior to it expiring and was up to date. I now get a story that my contract amount is R797-00 when im am supposed to have completed the contract!!! I also renewed the contract today for data and airtime only, with Raquel MTN consultant of R104-00 for another 24 months and have been told that it is over and above the R797,. I am a pensioner and i cannot afford to pay this amount which is not meant to be charged at the end of a contract. I am totally disgruntled and am requiring an intervention with this company and need to add that i have supported them for many years and am requesting that this amount be waived as i did not request for any data or airtime to be sent after the closure of this contract which i have proof of. My contact number is ***