MTN POOR SERVICE

My account has been paid up in full. (which has been confirmed via email) cancelled in September 2020. MTN doesn't even have any records of my number anymore, but I am WRONGFULLY LISTED WITH THE CREDIT BUREAU. FOR AN AMOUNT OF R2080. HOW CAN SOMETHING LIKE THIS HAPPEND???????? For 1 week I am trying to get hold of anyone to assist, but no luck. The 083035 doesn't give me an option to speak to someone in the legal department. When I once again phoned the landline *** this morning, someone informed me the legal department is closed and must try AGAIN later. *** rep**** I must speak to customer care. *** gave me the following query number: *** on 07/04/2021. NO REPLY OF SOME KIND SO FAR.