Vodacom Bad Service

I had an issue with vodacom whereby Vodacom phoned to assist on two contract upgrades, what was promised to reduce the overall bill ended up increasing the bill by 475.00 - I contacted Vodacom after statement was issued and they cancelled the upgrades, passed credit on system yet billing was still to remain for current month and credit only passed in the new month. I have contacted Vodacom five times now, each phone call being over 1 hour long and no assistance was offered. Team Leaders never available and Senior Managers you cannot talk to. How is this level of service accepted in today's times. I have been a Vodacom Client since the early 90's and a Red Premium Client. Absolutely shocking Vodacom!!