Vodacom allowing Third party claims and exploits customers

Vodacom allows third party claims on my vodacom account which I do not even know of. When I took up the contract I specifically requested the blocking of all additional services like content services. Yet after a year into the contract I get all kinds of services being billed to my account and vodacom pleads that they cannot block. They allow me as a customer to be exploited and does not offer any protection. I signed my contract with vodacom and not any other company to bill via vodacom. I am forced to block debit orders paymet requests from vodacom and rather pay them via EFT before the money is taken from my bank account. To protect myself from being exploited by Vodacom.