Are there any laws against selling used cars that should have not been sold?

Question Details: bought a used car and within 2 weeks the motor seized up on my way home from work. I don't think it should have been sold; it was not in good enough condition. The dealership stated they would fix anything wrong with it before we brought it home. Now they changed the engine and wouldn't tell me anything about the motor they put in it, so I don't want the car backs there. Is there anyway that I can get my $400 down payment back. Is there any law that would help me do so?

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