Comcast might be the worst company with which I've ever dealt. When you have a terrible awful problem with them (and you will, all the time every time), please don't hesitate to contact the store manager directly since that's the person you need to bother to actually get something done. One of the unhappy employees at this service center was happy to give me her business card:
Beth Hoffert
Telephone: 224-229-3260
Mobile: 217-519-0681
Beth_Hoffert@cable.comcast.com