Probably an obvious one that you'd already thought of, but the first thing I would do would be to look up the host name on the WHOIS database to get the address and phone number of the owner.
...That's if you don't already know these contact details of course.
Then at least you have something to go on.

Good luck, I really feel for you... but persist with this. Everything happens for a reason, and there will be a silver lining to this cloud.

Norman Austin