I have to say, I would be extremely cross in your position..
If you are anything like me, you would have thought long and hard about your exterior / interior colour schemes, and for a dealer to change this without consultation (whether they are allowed to do so or not) would not make me happy. It's a lot of money to spend to not get what you want. When I bought mine, I changed my mind about interior and exterior colour a few weeks before the car was due to be delivered, my dealership still allowed me to change my mind, saying that they would accept my original car and sell it to another buyer, and they then changed the spec of a car that was not as far down the production line to the spec I required. They couldn't have done any more. I suppose the thing to do is decide exactly what you would accept from them, then try and get it.. I wish you luck..