Sudden unusual increase in data usage

Suddenly, I have used 2x my average monthly internet data usage in 2weeks.

I was able (not easily I add) to chat with a representative and he explained that there is no way to learn what is consuming so much data. He did offer me to be able to pay for unlimited. That is not what I was hoping for - to pay more - when I don’t know why I’m having an increase in data.

If I had a long distance phone bill of yore, I would be able to see exactly what was causing my bill to increase. That is not the case.

Comcast could be randomly increasing my rates without accountability. It’s bordering on criminal. I’ll he reaching out to my state’s attorney general and reporting this, if I don’t receive a credible and helpful response