My question involves a consumer law issue in the State of: Texas
We had received a call from a customer who had seen our advertisement online and arranged to have an appointment and see a car we had for sale. After agreeing to a price and then negotiating the price down from what we had agreed, she paid in cash and signed the contract and "As-Is" forms. She and the sales agent drove to a drop off location and she left with the vehicle.
Our sales agent mistakenly let her leave with the title of the car as well as the title application, and dealer reassignment of title sheet (as all of the spaces on the back of the original title were full). Apparently suffering from buyer's remorse (and having admitted to receiving a better offer for a lower price on a similarly equipped vehicle from another seller) she began demanding her money back and to return the car. The calls, text messages to the sales agent, and harassment continued to the point that the local Constable's office was called to put an end to the situation.
Just before the Constable's office contacted the woman, she left a voicemail message wherein she stated she absolutely would not transfer the title into her name. As a dealership, we are responsible for reporting our sales and collecting the sales tax and are legally bound to transfer the title for all our sales. Our agent was new and unfamiliar with the rules, and only collected the purchase price of the vehicle - no monies for taxes, title, or licensing.
While refunding is absolutely not an option, and with her adamant refusal to transfer the title (and most likely inability to do so if the County Tax Assessor's office is aware of the requirements that the representative performing the transfer be a member of the dealership), is there a way to compel the customer to produce the title?

