If the dealer is now reneging on a deal, you should see an attorney with all of your papers and go over all of the facts. You will need to establish the existence of the deal. They might Try to repossess the second car.
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It appears you've attempted to work with the dealership to remedy a problem they seem to have created. Unfortunately your attempts to fix this problem amicably and swiftly have been unsuccessful.
Contact an attorney familiar with contracts and business law. Good luck!
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