I think he was saying that home-use personal routers (e.g. Linksys, Netgear, etc.) have been unplugged from their cable/dsl modems for a month, and people have still been billed for usage. Hopefully they were promptly unbilled, but that's not a fight I'd want to have every month.
You can absolutely monitor your own use. I really like ntop (http://www.ntop.org/overview.html) - give it a shot; at the very least it's interesting to see your traffic broken down various ways, what protocols you're using, and who on the net you're talking to.
If there were a discrepancy with metered usage, it'd be handy to be able to show it.
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