You can file a complaint with the entity who regulates your first lienholder and the entity who regulates the car dealership. It would your department of financial institutions and if it is a federal credit union, the NCUA. As to the other options, you can contact the named trustee in the bankruptcy and see if a motion to the court needs to be filed by you to a) have the bankruptcy dismissed because of fraud and b) if your claim can be considered a priority. Further, contacting the department of financial institutions may be able to help you because you can file a complaint (no cost) and if the agency can obtain a solution for you somehow, you may not need to go through the bankruptcy court. Also, simultaneously contact the office of the attorney general.