If he owes you money, talk to an attorney. The LLC protects him somewhat, but if you can prove that he knowingly sold you something he knew he wasn't going to deliver, you can probably sue him (Sam, the individual).
I would be surprised if people don't go after him. There are quite a few pissed people out there who know where he lives/works.
Edit: Not like, physically attack him. Calm down christ.
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