If you have discovered (through verification by the manufacturer or authorized dealer) that the odometer was rolled back, then your disclaimer really means nothing because this is considered fraud, and an unfair and deceptive trade practice. You can file a claim through the agency who regulates this entity, which would be either or both the attorney general in Texas or the office of financial institutions in Texas. If this motor vehicle was purchased with a loan, contact your lender and let them know what occurred, show proof and they may be required to inform the dealer to buy back the contract and fix this problem with either a replacement vehicle or cancellation of the contract, return of your monies and cancellation of the loan.