I am pretty sure that you would end up spending more money trying to get a lawsuit against them than what it's worth.
Indeed. Now individuals could probably sue him in their local small claims court and win but they are unlikely to receive their money back. You can file fraud claims with the post office and other authorities. If they receive enough they may go after him. You could also inform the police department where Protech conducts business and see if they'll pursue further action. But in the end chances of getting a refund are slim, so you'll likely just be wasting your time.