Data disappearing

I bought 3G data on Fri morning and the same day in the afternoon it was gone. I called the call centre and i was told the data wasn't loaded and i was given it back.

Sun morning, it was gone - again. I was told app's were probably eating my data while on Sat i spent my whole day on a flight and when i got home i was using my home WIFI.

There's absolutely no way i can use 2G of data in less than 24hrs with no downloads done.

Vodacom cannot do this to me.