No, it’s a deposit, you have shown commitment to the dealer by leaving a generous deposit, you need to speak to the salesman, why would they want all the aggro of returning a deposit, reordering a car. it’s your right to do all those things, even order at another garage. Diplomaticly stand your ground, show the evidence, give them the opportunity, to add the discount to your final bill. They would add a pack if you asked. Dont leave it too late.