Have you tried getting a hold of Mike Cave, owner via social media. They have a FB page. I'd send him a pm to see what's going on with payment. Try collection agency to recoup some of your money owed. Sucks that you're not getting paid, but you could write it off as a bad debt for next year taxes. (I'm not trying to be funny).

Using social media like FB, Twitter and even LinkedIn and # company name will get their attention as well as the attention of their clients.

No one wants that type of publicity. Good luck and keep us posted when and if you get paid.