1. go to the »
www.fcc.gov/complaints web site.
2. File a complaint against both Comcast and the company you purchased the modem from.
3. Let them figure out who wants to make it right or get investigated by the governement.
I know Comcast has a policy to not support that modem, but that does not mean it s a legal policy, and suddenly things change when governments threaten to investigate. It may be Comcast has every right to not let it in, and the other company needs to take care of it, it may be comcast employees are being lazy and will change their mind when a regional sup starts chewing back side off them, either way it takes 5 minutes whats the worst that could happen? They say they cannot help you? I'll bet it ends differently.