Loulou - having to wait is not good enough! What a poor show? Why don't you phone the garage and tell them so and ask exactly what they are going to make this up to you?
I would ask for the loan of the Demo Roc they have for Sunday. They'll be too busy all day Sunday anyway sending out all of the new cars. (I'm getting mine at 8am sharp! and the sales reps seem to have people booked in on the hour.
If not a loan of a ROC for the day - what else - as you have been so badly let down? Free tank of petrol, Mats, a sciroco key ring but you must get something! Tell them you'll name and shame the garage but remember you can't do it on here [Just noticed the house rule about this!] good luck.
Don't forget if the car arives on Monday they still have to do the pre delivery checks - is there a mechnic availble and booked to do this? Then they need to polish, buff and prepare "him" for you - could this delay you another day or so? OMG!
Cheers
BoaT