Earlier quoted context omitted.
Assuming Comcast is the only ISP in his area, can he sign up for a Comcast business account? It appears he doesn't just want his account reinstated but he expects unlimited data use.
The problem may also be that Comcast (and a few other cable ISPs) may refuse to give someone in a residential area a Business account. In my area they refuse to do it ostensibly for zoning issues (which really have nothing to do with it). It's one of the big reasons that I do not use any of the online backup places.
In fact, my boss/company owner, who lives outside Scottsdale, who can't get more than 144kbps IDSL got so sick of things that he ordered a first, then a second bonded T1 to his house, without any hiccups.