If I were you, I'd take any money I could get back from the "seller" at this point, but you're going to have to fight to get it all back. The house at the address listed for the business went into foreclosure earlier this month -
https://www.trulia.com/p/tx/humble/3926-hidden-glen-dr-humble-tx-77339--2069247624 IF the house was indeed his business, home, or investment property (the owner of record was Courtney Eiva), it certainly doesn't look good.
When I dealt with a shady eBay timeshare seller, in final desperation, I contacted the local police and filed a formal complaint. I'd read posts from other people who had been scammed by the group, so emailed them to ask them to add their complaints to the police report. It helped to get a point of contact at the station so all complaints went to one detective who could verify the pattern of fraud and build a case. When it was shown I wasn't simply a dissatisfied grumpy complainer, and it wasn't an isolated incident, the police got serious and coordinated with the FBI for mail fraud. Taking thousands of dollars from multiple buyers is a serious felony. Thankfully, we all got our money back.
I believe the local police stations for the address above are:
Kingwood, TX: (832) 395-1800
Humble, TX: (281) 641-7900
Hopefully, you have good records/copies/screenshots of the ad, the sale, and all correspondence.
Again, good luck!