Account number A*** MTN black listed my account

Account number A*** When are you going to fix this issue because this has *****ed my credit worthy ess for no apparent reason. I attached here document I received from Pertunia Hlanzi the day I went to the store to request for cancellation of the contract and she assured that it would be cancelled. In both 2019, 2020, 2021 and 2022, it’s clear now without actioning the request. In right frame of mind do you I would get myself blacklisted for a mere ZAR127.