I had the same problem when I first signed on with comcast. I argued with them that I couldn't be using what they said. They agreed but to no avail. I finally went out and bought a new modem so I could monitor our usage and fought some more. It was on their end not ours. Took a total of a month or so after the free 2 months and it dropped 75% down to under 300gs per month. I do unplug my second tv as the roku still uses data even when the tv is off. I still monitor it because I don't trust them. If you are using a comcast modem they can verify what is running and what you usage is. If your tvs are off and they have a unusual usage, the problem is on their end. Don't give up.
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