Sapien Designs Aka Dominic attempt to fish and steal confidential information on my product

This freelancer is apparently an engineer who contacted me when I posted a proposal. Despite the proposal being clear on the type of product this was he proceeded on saying he had the experience to solve the issue for the part and continued to prob me for details including the retail price of my item to get information for himself. Once he had done so, said he was working on a similar product and therefore could no longer help me. Clearly a thief and a scam.