I would be cautious of pressuring Comcast too hard. If they decide they are doing more than troubleshooting a "home install" then they may bump you up to paying "business class" which is usually quite a bit more expensive.
Exhaust your options with family and friends first.
Also as a matter of general advice for anyone, don't pay your service provider for wi-fi. They will likely charge you a monthly fee for it on top of your high-speed. It is preferable to just pay for the high speed which gives you a the highspeed modem, then purchase on your own a wireless router. That way it is a one shot payment and you aren't paying for it month after month. (Last time I checked TImeWarner in our area was charging an additional $9.99 for wireless router rental ... that would pay for your own in a matter of 4-5 months.).
Swirt...I did puchase a wi-fi ($80 or$85.00 from Wal Mart) but the Comcast guy said it was not going to last but 1 yr and to purchase theyre rotor.I did and I now have problems. Yes they said I have to pay $19.99 a month then it goes up at 6 mo., but I still do not have wi-fi . In a big jam here in Bwater..Mary
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Mary, can I suggest that you call up a local computer company (not one of the mega stores) and have someone come out to your place to figure things out for you. I'm fairly tech savvy, but this is what I did. It's also great to have a specific local person to call if I'm having any problems with my system.
If you already have purchased a wi-fi router, try to call comcast to take theirs back and stop paying for their router. Just tell them you've changed your mind and don't want wi-fi. If you can do that, you can get this independent person to set up your system.
Best of luck.
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