Massive spike

This SAME exact thing is happening to me. Ive had the same data plan for over a year with no issues of even coming close to hitting the cap. Suddenly, October, I hit 1.3TB.... I changed my password, but it did no good. Ive tried pausing devices on the network to figure out what was doing this and thought it might have been my Roku device, but that was not it. November went over2TB of data usage, and Cox's "help" is laughable at best. Like you they blamed me.... My cycle just reset 3 days ago and I am already at 28% usage... the last 2 days I have completely unplugged my Wifi Router altogether while I am not home, so at least 12hrs, and it still showed 110GB of data used. Though Cox's website CLAIMS their Panoramic Wifi Gateway can break down usage by device, it absolutely can not.... You can see what devices are connected and you can see the days total usage, but not until the day is over.... I am absolutely fed up with their lack of any kind of help.... Im ordering a new Router that CAN track individual device usage..... If I had any other option for ISP I would gladly take it, but in my area there is nothing.......