*****ulent debiting of bank account on cancelled contract

These people are literally messing up my life! My credit record is in shambles because of their stupidity! I entered into an agreement with Mix Temematics (BEAM) for vehicle tracker services in 2018 for a period of 3 years. On expiry of my contract, in 2021 I received a call from them informing me of the expiry of my contract and whether I would like to renew it, which I expressly made it clear that I do not wish to continue with their service and thus will not be renewing my contract. But because they are *****sters, they continued to debit my bank account despite having canceled the contract with them. I sent them numerous emails between the year 2022 and 2023 demanding for the immediate cancelation of my contract and asking that they immediate put a stop to the debiting of my account because even FNB said it can't block them because they chance their reference every time they debit from my account. Eventually in 2024, after pestering them on the phone I received written confirmation of an immediate cancelation of my contract, which was effective 14 March 2024 ignoring all the other times I had sent them written communication asking for cancelation. Then their cancelation department apologized, said the fault was on their side and that they would reverse the negative listing they had placed on my credit record within a period of 20 days and they would further refund me for the money they've been *****ing from my account post cancelation. Today's the 4th of July 2024 and I still have a bad mark on my credit record because of them!! When I called just now, one of their rude agents told me that I'm a bad debt and that's why my account is still reflecting open for billing and suspended on reason of bad debt! What nonsense is this??!!! Please help me!!!! Where do I report these people!!! Which Ombudsman do I teach out to??????