Data depletion

As a prepaid Vodacom customer, I recharge often and most times my data lasts, however this is about the 4th time where I have purchased a 1Gig data bundle for 14 days and within the first day it got depleted. I know that I did not use 1 Gig worth of data and I really find it frustrating to have to top up the very next day when I didn’t even get to use my data. It’s just getting tiring now, especially because this is not the first time that it’s happened.