You definitely need to consult with a real-estate attorney (especially one who has experience doing forensic loan audits).
Lynn911 Dallas Realtor & Consultant, Loan Officer, Credit Repair Advisor
The Michael Group - Dallas Business Journal Top Ranked Realtors
You absolutely need to contact an attorney, preferably the closing attorney that handled your refinance. This is a complicated legal situation and you should seek the advice of a professional. Usually, the closing attorney will help you with little or no extra fees, but that all depends on the situation, the attorney and how much is involved.
This may also need to involve your divorce attorney, but the closing attorney can point you in the right direction.