There are tricks of getting someones info, if they are slandering you and ruining business with false accusations.  If you need help with PM me, I can tell u the tricks.  Also yes Badbear is right get a lawyer, and Theymos will  give out his IP but you better hope hes in ur same country, also if hes using tor, then there is no way to get him.  I use tor and vpn, so I can tell you that is not easy to get there info with an fake IP.