Vodacom is riping consumers off!!!!!!!!

I purchased 250mbs of data and within 2.5hrs the data had depleted (what upsets me is that I wasn't even using my phone at the the). I complained about this and Vodacom reimbursed me with 200mbs which also disappeared without me touching my phone in about two hours (WHAT ANGERS ME EVEN MORE IS THAT WHILE I WAS ON THE PHONE WITH VODACOM COMPLAINING ABOUT MY DATA DISAPPEARING THE SMSES STILL KEPT COMING THROUGH THAT THE DATA IS DEPLETING). When I tried to make the consultants aware of this they tried to blame my phones software, the fact that I'm on 4g network and even on being on whatsapp. Vodacom now has the nerve to tell e that I should go to the branch and have my phone checked out (my question is a) why has this problem never happened before in the past 2 years I've had this phone? b) are you therefore telling me that I should not load data until you're done with your false investigation or should I keep loading data that will deplete in a blink of an eye i.e. keep enriching you and throwing my money down the drain? I am sickened by how Vodacom treats their clients given that it is the most expensive of all networks. Are we not entitled to get value for money?!!!!! YOU WELL KNOW THERES AND ISSUE ON YOUR SIDE THATS BEEN CONSUMIN OUR DATA AND AIRTIME WHY ARE YOU SHIFTING BLAME TO YOUR CONSUMERS??????????????????????????