Concerned about data not being allocated on a new contract

<p>From 1 March 2017 I upgraded my Vodacom account. The new package included a data bundle of 750MB per month.</p> <p>On 1 March 2017 I noticed that my phone wasn’t receiving any Wattapps etc. When I looked at my Vodacom app (As I have always done). Normally, in the past the app will show for example:"500MB of 750MB left”. When I looked at my data balance on 1 March 2017 it said 0MB of 0MB left.</p> <p>I phoned Vodacom and their excuse is that I used all my data (all 750MB) in one day. I find this very strange as I have been on a 500MB data bundle for the last 4 years and my data have almost never run out in a particular month (I have wifi at home which I use most of the time).</p>