Vodacom just do as they please with your invoice

I have been calling Vodacom Customer care for the past few months now to resolve the issues i am having on my invoices, and every time they say they will remove the items loaded on my invoices without my consent, but once the new invoice comes back it just appears on the invoice again, 1st i dont know how and who gave the permissions to even load it on my account , as i signed a contract with them, but they just add what they want to, now i say to you Mr Vodacom, if you dont fix this i will cancel my contracts with you, as you are in breach of our agreement.