MTN Falsely Blacklisted ME after Requesting my Account Cancelled... ref no to prove it ***

This is my second review for MTN around the same problem. the reference number given to me by MTN was ***. the failed to cancel my contract of R149pm timeously and then increased my monthly Premium to R539pm. my First emailed request after many telephonic requests as escalated to customer care on the 25 Jan 2021. They have debited my for months without my consent and after numerous requests to cancel my contract. As a result they now owe me in close to R5000 in premiums paid to them from November 2020. Now I am being harassed by debit collectors advising that MTN has handed me over and has listed me on the Credit Bureau as a Poor Payer! what absolute HOGWASH! MTN has as a result of their incompetence, lack of customer centricity and blatant disregard of the implications of their in action crippled my ability to obtain future credit agreements e.g. a home. I need a Senior Member of management to contact me on my *** to get this matter resolved and my bureau records cleared of all defaults. i also want a formal letter of apology from MTN absolving me of their listing on the bureau. this was their error as a team and organization and not mine as a consumer.