If you believe that you qualify under the "lemon law" in your state concerning the vehicle that you purchased, I would write the person from whom you purchased the vehicle from a letter stating the problems that you have with it requesting that he or she return the money pay in exchange for you returning the vehicle that you purchased from him or her.Keep a copy of this letter for future reference. If you do not receive the response that you want concerning the vehicle you purchased from the seller within the time period that you want, your next option would be to consult with an attorney who practices "lemon law" in your state if you wish to pursue the matter futher. Or, if you prefer not to consult with an attorney on the subject, you can file your own lawsuit against the seller.