Your Linksys routher is connected to the cable modem right? So the final mac address is your modem mac address which is not changable unless you change your cable modem (its in the back of your modem), I think you should buy another cable modem and call comcast and tell them your old modem is not working, just make up a reason blah blah, and they will ask you to provide them your new modem serial and mac address so they could enter it in their servers, I am not sure but I think that could solve the problem. The easy way to find this is to use a dial up with new account and see if they get you again.
Cheers
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