Used all my data??? This has to be a glitch.

I woke up this morning to emails saying I used all my data. One at 4:40am said I was at 90% and then another at 4:52am said I was at 100%. I was asleep and my phone was in sleep mode on wifi. I’m only a week into my billing cycle and there’s zero chance I used this much data as I barely get to 4 gigs on a regular month. I’m at home on wifi most of the time. My call minutes and text numbers are wildly inflated too. Wtf is happening? Reached out to support and I only got a bot.