Dealing with the ISP or hosting company is a major pain. I actually posted about something similar not long ago at:
Google removed links
One of the stolen pages was actually on googlepages, and Google won't return my correspondence or take the page down, so even the big boys don't seem to care.
I ended up sending letters to the Attorney General, Better Business Bureau, and local legislators about it last week. I don't know if it'll do anything, but the only other option I have is to come up with about 5k to sue them.
Good luck to ya!
Ty