The short answer is there is no way to force these sites to do anything. They are outside the jurisdictions of most countries and it would cost far more than $2000 to force them to pay out. If you used financial information from a legitimate person, you'll want to get them involved quickly.

[edit] I know some sites are licensed, certified, (or something like that) within the EU but I have no idea about UK laws so I'll have to take a pass from here.