Need assistance

On my old line with vodacome I had a problem because they would call say my data is not lasting and say they can give me a new plan for the same price but when month end came I was paying more ....against my wife's advance I took a new contract...a new phone for her but she kept her older number and I new Sim for me ....now they recently called me to say my wife's number data is not lasting and they can upgrade the number for no cost but now I see on her line it's cost.has gone up by 100 rand ....we don't need extra data.as we have wifi and I went into the store to have my plan reversed and they said someone will be in contact to have the plan changed.back I am.still waiting...vodacome knows how to call.when it's time for a contact or when they want to offer you something but it's hard to get a call.back