Comcast use Offerwire.com to advertize free modem and router after rebate to get Internet customers. After order the modem, router we found out the rebates are credit card's money, not cash.
offerwire.com known as bridgevine.com, a comcast dealer.
https://www.secure.bridgevine.com/comcastequipment/
Anyone needs to be carefull of these companies. Comcast needs to do a better advertizing to get trusted customers.