Best thing to do is get a lawyer. Customs vary in different parts of the country, so I can't speak to Salt Lake City. (However, I do have some good contacts there, if you want to send me an e-mail.) But generally an escrow company holds the money until all parties direct that it be released. You say that the deposit wasn't tied to the purchase of any property. Does that mean there was no other individual or person involved whose permission would be needed to release the money? If that's the case, then, yes, I'd be very concerned, too.
And how have you been making your requests? Hopefully in writing. And, recently, hopefully by certified (or registered) mail--something you have a record of. And even if there is another person who must agree to the release of the funds, the escrow company should have communicated that information to you.
So: Get a lawyer. Let him or her handle it. You've done what you can.