Vodacom - Inefficient and Ineffective

Vodacom have been unable to resolve my query for more than 12 months. I moved all 5 my contracts from Cell C to Vodacom because of the poor service I received from Cell C. I am sorry to say that the service I receive from Vodacom is unfortunately worse. One of my five contracts cannot receive sms messages or phonecalls and Vodacom have been unable to resolve the matter for more than a year. They have been debiting my account every month yet I am not receiving the service I am paying for. The amount of time I spend on the phone with Vodacom is crazy and each time I have to explain myself all over. No one person seem to take responsibility and calls are very rarely returned. They would phone me once and if I do not answer the first time they just close the case. I need the contract to function the the way it should, in need the phone to be able to receive calls and sms messages. I also need a full refund for the money Vodacom debited my account with although they did not render the service.