Vodacom won’t close data contract after cancellation

I had a data contract with Vodacom which ended last year October, I called the 1st of October to cancel the contract but October and November debit orders still went through. I’m December I reverted the debit order cause the have confirmed the account has been closed. I called them again beginning of January 2022 for them to rectify the error as I am still receiving their statements with my account in arrears. Till today the bill is still going up and reflects that I missed a payment. This is badly affecting my credit score!!!!! Why is it always difficult for you Vodacom to close the accounts after multiple calls of cancellations. Your credit department said my account will be rectified, 4 months later it hasn’t. My credit score went from 680 to 613 because of your f*** incompetence!!!!!!