While I agree that you should get your deposit back if you don't like/want the car, I think your case would be stronger if you reject the delivery for cause and request your deposit back rather than request your deposit for no cause/reason.
If Tesla delivers a used car to you undamaged and in great shape, why not just accept the car? After all you did want to buy that car when you put down the deposit.
On the other hand if they deliver to you a car that is damaged and in unacceptable condition I bet few would take the position that you should not get your deposit back as that would be an absurdly unreasonable position to take.
In fact we know from the forum that anyone wh
o rejected delivery because they were delivered a beat up/damaged car was able to get their deposit back.
Of course, all this nonsense could be avoided if Tesla would contract with Kia to sell their used cars as apparently Kia knows how to refurbish used cars, make a profit while doing so, staff the sales operation so customer questions can be answered and treat used car customers fairly by offering a quality product
Who knows, maybe in the new year Tesla customers will be treated as well as someone buying a used/CPO Kia