How does an ISP like Rogers define "download"?

-I would like to get to the bottom of this, my plan says that I'm allowed to download 60GB, however, it said I went over by 13GB. I did not download much during the month of June, but the account says that I've been downloading 7 GB a day. What I downloaded during that billing period were only 15GB of games like TF2 and LoL. So I would like to ask: what does the ISPs like Rogers define as downloading?