Cell C complaint

My wife's contract renewal is due and Cell C phones daily but each time the offer is different. We went to the Cell C office in Centurion Mall and they offer again something different. We prefer to sit with Cell C (Centurion) and discuss the options SIMILAR to what my wife has got. Question why are we getting different offers by phone?--again based on her current contract. It is a simple contract and she is happy to upgrade but she does not want to sacrifice what she has and she do not want to pay more. Otherwise she can go on as usual. Cell C must be consistent in what they offer my wife. We are very unhappy that we cannot conclude this. I want somebody to explain in simple words by starting with her current contract and we are prepared to go back to the Cell C shop