You should immediately write them a letter detailing your position. Ask for a copy of the papers you signed to look it over. Finally, if all else fails, offer to pay a portion of the fee in exchange for a release.
I am licensed in New Mexico and Pennsylvania, and therefore any discussion of issues related to other states must considered within that context. In addition, my comments are not intended to create a legal representation but merely to respond to the limited facts presented by the question. Any opinion herein is not meant as a precise statement of legal rights or as a recommendation of any particular course of action. A more complete legal review can be obtained through local counsel.