Exploited by MTN SA

I wrote a review last month on the struggle I am having to stop MTN from loading my phone with data and debiting my account after my contract ended with them (in March 2025) and nothing has been done on the matter. Can someone please refer me to where I can get help on this matter. I had called them before the contract ended to indicate that it is ending and I do not want any other form or shape of anything from then once that date comes. I have been ghosted by the official who gave me her email address. I do not get helped via calls.