Get down payment for cars and not picked up, what now?

Hello, I need some advice. I had hired a vehicle via Ebay, shortly afterwards I get an e-mail, which an insider absolutely wants to have the vehicle. We make a price and you pay 100,- (price 4500,- ). But until Friday you did not know when you could pick it up, I took the vehicle because of the deposit then about 20 hours before the auction runs out of Ebay, because the deposit was there and the car is sold. On Sunday d he buyer now, that you can no longer take the vehicle, because you have trouble with your husband and you now want to return the deposit. Do I have to pay it back now, because I have not been able to sell it over Ebay. I have been damaged by it, do I really see that?