Good morning. You should send them a certified, return receipt requested letter explaining the history in detail and demanding that they immediately release your car at no cost to you within a short specified period of time. Inform them that if your demand is not timely complied with, you will have no choice but to file a suit against them. They had no authorization to repair the car; in fact they had direct orders not to yet did anyway. You'll do fine in court if it comes to that.
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