Seat are responsible for the order until it arrives at the
dealership, not the dealer. I'm not sure why your dealer is suggesting Seat will provide you with conflicting information. Talking from personal experience, I was able to extract a lot more useful information from Seat than my dealer. It's up to you but you are within your rights to request the order number.
Mystic blue is nice too. I was deciding between eclipse orange and desire red before ultimately going with the latter.
I'm going to be patient and wait until collection day before I see it in person, but I did ask Laura last night for a couple of pictures. I'll upload them on this board once received.