Cancelled contract but still being billed

I called Vodacom July/August 2020 to cancel a contact that has come to an end. The account number is QC292519-2. I still received accounts from them which is no surprise as you have a long track record of doing this. I then called again to complain as to why it was not cancelled. The consultant then confirmed they will cancel it and that I should contact their billing department. I am still receiving bills. You people are absolutely useless and I just took out another contract with a useless service provider. Please refer back to the calls received for the number ***. You will pick up calls where cancellations were requested and confirmed. I am opening a case with the ombudsman as you rob way too many people and I am sick of it.