Didn’t you check the car over before putting your PIN in on collection day? If they have supplied a different model to that stated on your order I’d be straight onto MB and the dealership.
The reduction in AP is more clear cut, it was up to you to be aware of the change when it happened and to have requested the dealer cancel and re-order at the new AP. Although they’re not obliged to do so.
If I seem a little strange, that's because I am.
Skoda Karoq SEL.