Data Usage percent increase of ~700%

The data usage at my household went from ~150 GB in July to ~1200 GB in August!! That's just not possible, I decided to monitor data usage this month and it's already at ~200 GB SEVEN DAYS IN. Thats outrageous and not possible with internet usage at my house. At the end of last month I spent hours going round in circles with the online support only for them to give me a small credit and not explain why this misrepresentation is occuring! I took a look at the Xfinity forums and many other users are having this issue. It's outrageous!