Unauthorised debit orders & double billing for one account

I have had endless hassles with my Vodacom account. My problem was escalated all the way to the CEO's office and the lack of service there is even worse than calling their call centre. Despite all the other issues, I have recently discovered debit orders going off my account and my fiances account for the same data contract. They were effectively double billing us. I informed the consultant, Rani via email. She has not acknowledged my emails and has ignored all my phone calls and messages. I do not know how or where to escalate further if the CEO's office cannot even assist. Shocking customer service from Vodacom and even more shocking the double billing.