for the most part what i have seen is prop firms will pay maybe late but they will pay, also i know i didn't know my whole contract when getting money out and had to wait longer to get deposit. Make sure you know your contract
Consult an attorney if you're seeking legal advice. If it was an unregistered firm, then you may be in for a rude awakening. Review these threads for more info on prop firms that won't pay: http://www.elitetrader.com/vb/showthread.php?s=&threadid=227275 http://www.elitetrader.com/vb/showthread.php?s=&threadid=202030
Get into a car, drive to the nearest police station located within proximity of their physical address, and file a police report complaining about theft. Lay down a marker, and that one is simple and quick and effective in getting one's attention. Insist that the police officer taking the report refer it to the appropriate regulatory authority. Start a paper trail with a regulatory body.