Contact the dive agencies he represents and call the retailer he represents and let them know of the problems. call your credit card company and see what you can do there. Don’t accept half assed stories from him about why he didn’t produce the right merchandise. Do you have a TV station with a troubleshooter or customer help service. A little bad publicity goes a long way. Not only will you help yourself, but other divers - both new and prospective, but other dive shops too. Good luck. by the way I am an LDS OWNER that doesn’t do business the way that shop does.