4GB Data Vanished Without Trace

I have more than 70Gig of data on my Night Surfer bundles, and this morning around 06:00AM, I checked my balance and I had about more than 4Gig of data. <br> Today, I wasn't even much on the Internet on my Samsung Galaxy S4, and it any case, during the day I use about 100MB roughly... <br> <br> But when I got home this evening around 17:30m my 4 Gig data was finished.<br> <br> As always, I had to call in for adhock 5Gig of data and paid R399 coz I have ran out of data without trace. <br> <br> Yes, I tripple cheched my balance this mirning to avoid similar faith of Complaint SM124879 that's still pending resolution, but it was correct and the usage was on Night Surfer and had about 4Gig data around 06:00AM, but now, it has vanished.<br>