I don't know what this story is all about, the Comcast caps have been very clear for a long time now. They have also provided an area on their website in your account panel to show you how much bandwidth you've used.
This user seems to think Comcast has to give them a list of things they downloaded or something to get to the cap and that's just not a realistic thing to expect. I know Comcast's service can be pretty bad, but this one isn't their fault.
Almost any router now will keep a log of how much bandwidth you've used over a month of time, so I'd highly recommend that everyone take advantage of that and keep an eye on what Comcast says you've used. If they are two completely different numbers, then you might have a case.
Also, someone can correct me if I'm wrong, but I've never heard of Comcast cutting you off after one month of going over the cap, most likely this user went over the cap at least a few times and was warned what continuing to go over the cap would do to his account standing.
As I said, I can probably write a short novel on problems I've had with Comcast, but this one I can't see their fault in the situation.
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