There was a problem with data usage counts in September and Comcast is aware of this. The Xfi only tells the percentage of date used per device - not how many G used by device. They told me the to use the Xfi app too when asked what device was using all of the data I was being charged for. They are supposedly going back and fixing their mistake but I have yet to see it on my account. We went from using 70G a month to using 1250G and we were out of town the last 10 days of September! I checked and nothing was going through our modem but the data was going up hourly at an alarming rate. They should have to give us detailed usage reports every month on our data usage.
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