Vodocom consultants is not competent

I have been with vodacom for more than 25 years but today I am so frustrated because you come up against a wall. The consultants have no idea what they are doing and then the client has to pay for their mistakes in the end , and when you question it , they just shrug their shoulders. I did upgrades on both my phones by phone and accepted a deal suggested by consultant, after I explicitly said I didn't want to pay more then my current contract per month. All of a sudden my bill is R350 more per month and they say that they cannot change it according to the contract, but this is not what I agreed to. The consultant made a mistake but now they do not want to rectify my contract as I have initially requested. The deal that the consultant offered me and that I agreed to was not given to me