MTN changing packages and billing without consent.

I last took a contract with MTN In 2019 which expired in Jan 2021. It was a Sim deal with the relevant data and voice minutes needed. This moved into a month to month since than. In August 2022 my package was changed and they now charging me over R500 for a package I never agreed to nor did I authorize any adjustments. In Jan 2023 they reimbursed me some of the funds, but are refusing to correct my package after promising to have it corrected and billing adjusted to what I authorized.

They have transferred me from Customer care to Sales and then retentions. Only to refer me back to customer care. Constantly treating us customers as if we are not loyal for the years on service we have been using MTN.

All I want is for my package to be reinstated as is. I have asked on numerous occasions to them to provide me with the terms and conditions which allow them to adjust my package as it was never an issue since 2021.