MISSING DATA AND AIRTIME

Good day,<br> <br> I bought a recurring data bundle (R159)on the 30th September and received R150 airtime on the first (top up contract).<br> One gig last me at least 3 weeks as i only use whatsapp and facebook.However on the 3rd all my data and airtime was gone i called and was told that it must be an 'update or a app that was open'.<br> I had my settings checked and the last update i done was on the wi fi therefore no data was used,my facebook usage is one gig since the 22nd August my whatsapp usage is 300mb(all the other apps are less than 100mb).<br> So how can my entire gig be gone??<br> I am connected to my work's wifi from 8 till 5 everyday therefore my data last long.<br> I will not pay this data bundle the end of the month as i am being **********!!!<br> <br> <br> <br> Regards<br> Kim