[BC] was just informed of 200GB usage in 6 days wtf shaw

I just got of the off the phone with shaw who are saying that my monthly usage is way way over they said that in the last 6 days that I m around the 200GB area which I cannot figure out because I have my routers wifi set to my two laptops mac address's and my 2 PCs nothing else is accessing my system as far as I can tell I always change my PW and my Wifi is turned off after midnight . I have been watching a few utube videos But does that really take up that much? I am not sure what to do because they also said my average useage is over twices as much ( 900GB per month I am definately thinking of switching to a different place not sure which one.