data going missing

I called in to lodge a complaint about my missing data on the 2nd Jan 2016, on the 1st Jan I received my 500megs data as I always do, I was home all day in a Wi-Fi area and by that night I got a message saying data depleted.. next day I got another message saying I had less then 96MG of data remaining yet the night before I was out of data, I checked and yes I was out of data !! today is the 22nd Jan and still no feedback about my query... My whole family of 4 of us are on Vodacom and have been for many years, we spend fortunes every month on phone bills, and I am really not impressed about been **********.. The past few days I have seen so many people on Facebook complaining about the same thing and most have gone to carte blanche to see if they can help with the problem.. I want my data back and my money refunded.. I am not in the wrong and don't expect as a paying customer to be ********** and then no reply to my complaint.. my phone bill the last three months is over R1000 more then what it usually is and this is unacceptable I want answers and so do millions of other people out there who are been ********** .. there is a few people who have the #Vodacom must fall on face book