Naa thats rubbish mate! Its just the dealers being lazy.
I am 20 years old. I have always managed to get a car.
When they messed up my order and it was 3 weeks late i demanded a car as they said it would be fine for me to sell my old motor. Week before, they said it was gonna be another 3 weeks, my sales lady said there was nothing she could do and all she was prepared to do was pay for my bus tickets. I spoke to the dealer sales manager and she pulled an 2.0li t A4 avant s-line out of demo for me to use as i told them I was disgusted that they offered the bus as a viable solution especially with my line of work. I explained the situation and she was very nice about it and understood my position. They gave me free fuel, insurance etc.
When my door dropped on my A3 and was repaired under warranty i got an 2.0li A3 for a couple of days while it was in the bodyshop.
Stick to your guns and they should be able to sort something. You kind of tell them how and what will happen. they kinda think they can tell you what to do just because you are young.