Bad customer care

Vodacom offered me a contract for R120 pm and after several requests to the woman on the phone 'what will it cost me 1 Sep when the contract starts' and she said R120. Now I checked my app and wow they are going to deduct R366.33!!!!!!!!! Called and reply 'no there is start up fee etc' - they said the amount will go off my account and they will refund me the extra maybe in 14 working days which means my budget is not balancing!!!! And they just shrugged everything off as if everyone has lots of rands in their bank account and R250 will not make a difference - but for me it is making a difference as I am a pensioner and every cent counts ?