no worries, you don't need pay any panny.

1. file a wh-4 complant form. check this box at least "Employer imposed an illegal penalty (as opposed to liquidated damages permissible under state law) on nonimmigrant worker(s) for ceasing employment with the employer prior to a date agreed upon by the nonimmigrant worker and the employer."
http://www.dol.gov/esa/whd/forms/wh-4.pdf
2. mail your fwh-4 orm to here:
http://www.dol.gov/esa/whd/america2.htm