Bad service

Vodacom is such a big name but the service I received on this contract is so disgusting. The consultant who I last spot to about my contract told me they are aware they I wasn't making use of my SMS's that I received on my package every month and asked of they could convert that to Extra data on my contract and I agreed. One mo th later my instalment increased from R399 to R550 and that wasn't disclosed in the call. A I spoke to them on the phone I asked to pull the call and I want proof as is to where I agreed on this. That was well over a month ago. I guess they're hoping I grow tired and just continue with this contract until they end of period I don't know what they thinking really