This morning I woke up with a text message from AT&T indicating that I used 75% of my data. As of yesterday, I had used 10%. So I get up and go onto my at&t account and it shows that I consumed 18 gigs of data whilst I was sleeping. Not to mention that I wasn't downloading anything, and my devices are always connected to my home wifi network. So I call AT&T this morning and they start telling me that the device MUST have told the network that I consumed that much data. When I look on the phone, it says my current period was 650mb... what do I do?