Beware of upgrading your vodacom contract

I am shocked at the level of service that I have been receiving from vodacom. I upgraded my contract with vodacom in august and since then my account has been billed with very large an unexplained amounts. I went back to the branch for assistance with no resolution. I have been on multiple calls with the callcenter, having to repeat myself multiple times. Nobody seems to understand that I am being billed amounts that are completely contradictory to the contract that I signed. I was at one stage issued with a service request which gave me hope until this was suddenly closed and I was notified via SMS. I am astounded at the lack of support and the way that I have been made to feel like a complete "number" to this company. I currently do not have any confidence at all in Vodacom.