You should really stay on these guys...you should also review your contracts clearly and in real depth. Have an attorney in Miami take a closer look if you can. There is a case here. Delivery contracts should have stipulated how delivery was to be executed to the states and it's final destination as well. If the contracts you signed in Germany clearly stated all this (which should have been the case) they are liable for all damage, fees, and elapsed time from a purchased product. Seriously get it cleared up with them and if they are not willing to compensate every single cent that you put out...consult an attorney.
It would have been spectacular if you took photos of the car being delivered as described in your posts.
Visual evidence combined with contractual should give you the weapons you need to get what's yours.
You do this and they'll settle.