Vodacom refusing to end contract after it expired

Vodacom is refusing to terminate the contract which was supposed to be only for one year.. I have honored the agreement to the fullest with no errears. The contract ended 16/01/2022 and i called vodacom to let them know that i am not upgrading my contract. They said the contract is still on until i receive an sms. They continue to debit my account for an amount of R210 while giving me only airtime of R175... My contract account is ***.. I don't know what kind of **** they are running but it is so bad. If i reverse the debit order it will reflect bad on my credit profile. I hope they resolve the issue very soon. My number ***