Vodacom/MBD harrassment

For past 4- 5 yrs have been harassed by both Vodacom & MBD through calls & emails for contract they claim I took with them which is far from the truth.First time I learned about this was an unauthorised debit order on my account which zJ disputed on banking app & reversed it & second month,the debit went through & I reversed it and requested my bank to put a stop on it(this was around 2020/1 if am not mistaken) The bank was initially reluctant to stop it and instead directed me to Vodacom to stop it .I went to my nearest Vodacom shop to report it & they give me a Vodacom ***** line to report it but my calls to the number went unanswered and reverted to same shop where I was advised to depose an affidavit which I duly did but to date still getting harassed .I had to compel my bank to put a stop to this unauthorised debit through help by banking ombudsman because Vodacom, though theiy are a technical company that have the wherewithal to investigate where this claimed contract was taken & which prerequisite document for contract approval were scrutinized failed to carry out this investigation to date.Been with MTN from day1 of its inception in 1994 having been part of MTN for close to 26yrs and them being MTN's competitor should have picked up that the number they call me on is normally an MTN staff number ***.Having been part of MTN from day1 , would be crazy of me to have a Vodacom contract.My loyalty remains with MTN & come rain or sunshine ,would never in a million years consider Vodacom & would with the greatest of request want both Vodacom and MBD put a stop to this harassment as they are now pushing to go the legal route. MBD have the nerve to even offer me a massive discount and even provided an Acc No:*** without even stating Bank name for me to pay for contract I know nothing about.This MBD normally calls from number ***