MTN contract migration without account holder's approval

My contract was migrated to a new plan without my permission. The migration was recorded for 19/03/2024, I however didn't recieve a phone call from MTN to discuss or even authorize this migration. I've sent emails to MTN customer care to have this migration cancelled but I've been sent from pillar to post without any resolution. Finally I got a hold of Nireeshna from MTN mobile plus, who confirmed that they will have to pull out recordings from 19/03/2024 and she'll revert back to me. She said I shouldn't call her again, she'll call me once all the data has been gathered, so until then I will be paying an extra R207,83 that I didn't authorize.