Vodacom keeps billing me for a contract that ended 10 months ago!!!! ****

Vodacom won't stop billing me even though my contract ended in January. This is affection my credit score, I called multiple times to cancel the month to month subscription but every single month I get an invoice, not for the phone but for data and insurance which I've cancelled!! I dont even have the phone or sim card they are billing me for. This is some sort of a **** so that I keep paying and not affect my credit record. PLEASE STOP!!!!!!!!