MTN is making me to pay more money and they refuse to resolve the issue for months

MTN won't resolve my issues and making me to pay an already cancelled contract and claiming i owe money

Last year September/October there was an issue with your debit orders (your own bank) but my debit order went through and i sent POP wich no one rep**** . We ended up agreeing that i will pay at the store while you are investigating but in December you made a debit order while i paid cash s well and still refused to reverse the money,

January i didn't pay because i double paid in December,

So my other sim card contract expired on the 16th January and i made sure its cancelled on time. But in February i got debit order with the wrong amount because my current contract should be R399, when i asked why are they over charging me , they said its because i owe money for last year but i sent bank statement and POP countless times and no one is doing anything .

My worry now is that MTN is not interested in helping their customers and its affecting my mental health at this point, no one is even bothering to investigate this situation while i get charged more every month

Please resolve this issue, I never skipped any payment and you should put my account up to date. and repay my money back that you keep taking without an explanation.

My Name is Shoni