Unfair business practice by vodacom

I am experiencing a problem with vodacom who don't want to accept the fact that I canceled my contract wish ended end of May 2024. They are still billing against my will even though I called and informed them about my decision to not renew my contract. When I reverse the money they place my name on the credit bureau ruining my credit score and my name. I want vodacom to stop this and accept that I nolonger whant to continue with the contract.