And depending on the os that you have, try release/renewing your ip address, if that doesn't work, or comes up with an ip starting with 169.254.xxx.xxx etc then re-install your tcp/ip.
If that doesnt work, its slightly possible its a problem on their end.
Additionally, let them do the troubleshooting also, they have to record all this stuff and follow standard procedure
Honestly you'll get your shit faster if you honestly listen, just act like a decent guy about it, and listen to the tech's suggestions, I know I certainly dont work fast for customers that try and rush me, I purposely slow down
Uhh, can you repeat that sir/mam? what? ahh ok umm (brain freezes because customer is acting retarded, thus I can't think)
If that doesnt all work, good luck!! hehehe
p.s., I used to sit beside comcast employees , well across a row of cubicles anyways