Vodacom Stole My Money

Vodacom is a *****! I was debited R1400+ incorrectly from my account in October, and I was promised that this will be credited back to me, till now this has not been done. I've spoken to several call centre agents, and none has helped me. I was promised call backs, and received no further communication. My upgrade was not put through, but was charged for double for a service that I did not receive. I was again charged for a different service that I did not request for. When queried, I was told that I would be credited within 7 working days, which again did not happen. Where is my money? I want my money back!