Vodacom customer service & call centre is useless

I upgrade my cellphone package from i talk 120 to a red advantage. I did the on line up grade in October 2014, it is now March 2015 and i am still on the wrong plan. I have been on the phone for days since October 2014 dealing with useless poorly trained call centre staff and very rude and arrogant as well. After being nice, begging and then screaming, shouting and totally loosing it i am still in the same place i was since October 2014. I even got hold of one of the senior managers in the customer care devision and still useless.I now want a credit for the over billing and charges i have experienced due to this. i am very upset and would actually like to give my cellphone back and have my contact totally cancelled and Vodacoms cost. The rude call centre people need a wake up call, we are paying customers and don't need this kind of service. I dont know what to do and where to turn to but i want my money back and my plan corrected. Vodacom services is *** and their people rude. i have lost count of how many calls have been logged. get smses telling me they working on it. But there has been no change in 5 months and i am paying through my ears due to this. I AM NOT A HAPPY CUSTOMER