You should contact an attorney to assist you. Whether you have to return the car will be dependent on the terms of your contract. However, there is usually language in contracts for the sell of a car if there is an issue with financing which allows for the car dealership to get the car back.
The content of legal guide has been prepared for informational purposes only and is not legal advice or legal opinion and should not be relied upon for individual situations. If you find yourself in need of legal advice for your individual situation, you should consult and retain an attorney.