1. Your state's AG [1]
2. The local TV news
3. Local police
I don't think I would call it a "legal scam," it sounds remarkably like fraud. Lots of modern fraud takes place over international VoIP calls, so the fact that there's a brick and mortar business with assets that can be seized means you shouldn't give up quickly.
> Even disputing a charge on the credit card — they have copies of our ID, smart.
Dispute it anyways. Yes, it may flip back on you once they disclose the fact that you were there. But just stipulate it upfront that you made the purchase but the terms were unclear or that the claims that they made regarding your rejection are false.
These guys sound like they are clever enough to try and make their scheme as close to legal as possible. They made sure that the amount you're getting scammed isn't worth your time or an attorney's time. But don't let them get away with it.
[1] Texas AG consumer complaints: https://www.texasattorneygeneral.gov/cpd/file-a-consumer-com...