Data dispute

I loaded 10gig data this morning at 6:48am. By 10am it was depleted. When I called Vodacom to enquire about this, I was told that I used the data by downloading, streaming or updates. I told them that I didn’t do any of that, they said they could not assist me.

I often load 7gig and it lasts me 2 weeks. I use the same Apps and the same phone. What happened to my data?