If an investigation reveals violations, the Department can take action, including asking a court to compel that the money be put back. If you feel there's any embezzlement, theft, kickbacks, or extortion going on, contact the Federal Bureau of Investigation or a DOL field office. The Department of Justice will prosecute any illegal activities. You don't pay any fee if you're not eligible for more money. The American Society of Pension Actuaries can help you find an actuary in your area.
Fees vary considerably, depending on plan complexity.