Having the same problem It showed up for the first time in Sept. 2019 where my data usage showed at about 3X what it's been since I've been on the current plan, probably going back about 9 months or so.
I may have slighlty increased my viewing of some youtube videos on my smart tv. but not that much.
After reading thise other posts, it looks like something is wrong on Comcast's end.
In my case there is no chance of wifi hacking as both my computer and smart tv are connected via ethernet and in fact. the button on the back of my modem for wifi, is turned off.
I can't tell exactly when it started , but it first showed up in Sept, and just on Oct 1, my data usage is showing at 84 GB. This can't be correct but since I own my own modem, Camcast says they can't isolate what device is causing this.
My tv, computer and voip phone are all working okay, and I thought maybe it was on my end, but now, I'm thinking this is all an issue with Comcast and it needs to be fixed.
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