I'd be pushing the point on this one. You are well within your rights for an itemized invoice, maybe mention consumer affairs and they'll get moving.
Before we had paid out deposit we were doing the walk thru of the house and the 'grand alfresco' outdoor kitchen is what sold it for us and were told yes yes of course you can have this. Deposit paid and we walk back through and all of a sudden they can't do the outdoor kitchen or any of the decking. I'm sorry but don't advertise what you can't provide. I wish they would have a set of display homes in each range and have them in base model / category 1. They are stil beautiful houses but I'm sure most of us make up our minds on the display homes, half of which are unobtainable.
My rant over