Vodacom data issues

<p>Two days ago I bought a 1 Gig data bundle from Vodacom and today I get a notification stating that my gig has been depleted. There is NO way I used the entire gig as I have been tracking data usage on my iPhone. Also, this is not surprising as the exact same thing has happened before where I've purchased a 1 gig data bundle and the next day it was supposedly finished. I'm so tired of this happening as I spend my money on data and do not even get to make use of it. This is very frustrating. </p>