Seeing this thread brings me a little comfort to know that I'm not the only one having this issue.
My problems started back in August, after changing my plan and modem in July. My reported usage jumped significantly starting in August, where I went over the cap for the first time since it was implemented. Since then every month has been pushing the cap, which doesn't match the historical trend of reported data usage. Historically for me a "big" month would be 600GB.
I was one of those customers affected by the billing software chage. I received the credit and had the "data cannot be displayed" issue for September usage. Even after the the billing software change was rolled back, I am still seeing excessively high usage reported by Comcast. I finally got tired of it and started collecting Netflow data off my router. My data collection numbers aren't even close to what Comcast is reporting for usage. There is clearly something still wrong with the data usage system. Comcast reports that I have used 158GB of data for the month of December. My Netflow data says that I have used 102.935GB of data. Comcast is reporting 54% more data usage than what I have measured at my router.
It's nice to see that there have been a few Comcast employees posting in this thread, Comcast really doesn't care about customers, as evidenced by their last known NPS score of -3. But in all those posts I haven't see any mention of actually fixing anything, just lots of bill credits for the inconvenience.
Can someone from Comcast please contact me and help me resolve the issue?
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