Empty promises and hidden fees

I would like to warn you guys to be careful when Vodacom phones you telling you a long soppy "fairytail" about them decreasing there fees (because they don't want to loos any more clients). i was phoned today and was told from the start that "this is not a call to sell me anything", but that Vodacom wants to give me more minutes and data to bring my existing contract in line with there decrease in fees. This all in a attempt to not loosing more customers. So after listing for how long to all this promises and just as she wants to change my existing contract I ask just to confirm,"so this all wont cost me anything extra?" and boom just like that all of a sudden, "NO its just R100+ rand extra..." So my warning to all is to ask the question early on, because it will cost you extra.