Gee wiz Crispy, I really feel for you mate...
One lesson about this to everybody is BEWARE when buying new cars from most dealers regardless of brand - They will try to sell you anything, whether you can actually afford it or not - they don't care - at the end of the day it's a commission cheque in their pocket.......
I have a very close friend who resigned as a salesman from a Werribee Holden dealer (yes I will mention them) because of dodgy sales issues he could not live with doing to people, that were being perpetrated and encouraged at that dealership !!!
I had 2 separate deals at 2 seperate Holden dealers fall through on a brand new Monaro and GTO respectively, over the past 18 months because of dodgy arrangements and dealings and there was 'no finance' involved ! and I had to threaten legal action to get my deposits back - which worked.
Once again BUYER BEWARE and always read everything on ALL documents.