Disappearing data

<p>honestly I dont believe that Vodacom still does this to customers,especially after fighting thins for so long I never thought it would happen again,disappearing data,I have 2 contracts with vodacom,and on the one I get 1GB and the other wi-fi get 3GB and for some reason both got finished very quickly again this month, I use 2 other bandwidth monitors to monitor my bandwidth and both give me a reading of about 1.8 GB total usage for my wi fi but according to Vodacom I've used 3GB on the wi fi and 1GB on the phone,note that the data is only used on one device and I have an anti virus installed,so no viruses,and updates have been turned off so no updates, and all this was from using facebook, I dont stream or even download when I use my own data/wifi I only do that via my work wifi,not even pictures, are you trying to tell me one device uses 4GB in less than a month on facebook (posting status updates) and to text on whatsapp??</p>