I agree with everyone else that you've been wronged, and you have every right to be angry and seek redress. All that I'll add is that you need to also keep perspective. It's only three hundred dollars. It won't be hard between internet researching, phone calls, filling out forms, court visits, etc. to spend another three hundred dollars trying to get your money back. Then, he's screwed you over twice. Take what you can get with a reasonable amount of effort, give him a bad Yelp review, and let karma take care of the rest. Don't drive yourself crazy trying to get justice.