The best thing you can do is talk to a lawyer. Normally they would start out with a DMCA and cease and desist notice to the webmaster, domain registrar and ho

The best thing you can do is talk to a lawyer. Normally they would start out with a DMCA and cease and desist notice to the webmaster, domain registrar and hosting company. If things still are not right, more then likely you would end up taking the site owner to court. If you have a trademark then you could also take them to court for using your brand illegally (you have to do this to show you are working to protect your trademark).