Well done .... seems the data debacle has not been resolved

Well done Vodacom ... it is the 5th of the month and my 500mb of data is all gone? I have FIBRE WiFi at home so don't use my data at home .... at work I only use WhatsApp on my phone! Last month I used almost 200mb of data in a day .... when I hadn't used my data at all as I was on Wi-Fi .... how does this happen? Is the data *****ing issue not resolved yet? So if one calculates, I used 700MB of data in 5 days with FIBRE wifi at home and only using WhatsApp (which is sent not to download pictures or video unless on a WiFi connection). I am actually too scared to see what my Back-Up Vodacom wifi has on it or if that has also all been used, depite the fact that I have done nothing on it and it has been switched off. Please resolve this issue as I refuse to buy more data!