I hate that I’m forced to take them at their word about my usage. I have a MiFi (mobile WiFi hotspot) with a 6gig data plan. Two months ago they informed me that I had used 34gig the prior month. There’s no way I could have pumped that much data down the pipe unless I was streaming movies 24 hours a day (I wasn’t).
I protested and they insisted. My only recourse is to change service provider. They have us by the short hairs.
You were hacked. Someone was piggybacking on your hotspot.