Over monthly limit

I've been working from home for over a year now and never gone over my monthly limit or even come close except 1 month when I downloaded several ps4 games. I recently lowered my xfinity plan (same data cap) and suddenly my usage shot over the data limit this month? Nothing else has changed with my habits or hardware. I tried chatting with 4 different support people using the xfinity app and all they did was play misdirection games and send me to another dead end support person. Please help me figure out why 200 GB over this month already or is this an xfinity upgrade scam like other posts have eluded to.