The answer to your question depends on who is holding the escrow. Is it a title company, attorney or a real estate company?
Because title companies are not regulated by FREC, it is much easier to get your deposit monies returned.
Notwithstanding who's holding escrow, I would consult a real estate attorney and have them send a letter to the owner demanding a release of for the deposit be signed and threatning legal action.
This may be all it takes for them to take you serious.
Best of luck!