Trip to Southern Germany and Austria

We booked a Mercedes C200, but when we arrived at the store, the staff informed us that they didn't have any Mercedes available. German precision, they say, but I don't see it here. We didn't specify the model at the last minute; it was reserved well in advance. Why didn't they reserve the car for us knowing we had an order? The key point is that when we arrived at the Europcar parking lot, we indeed saw at least two C200s parked there, which means the staff was deceiving us. Extremely frustrating, this kind of blatant dishonesty, lying straight to our faces without any cover-up, shows a complete lack of respect for us. This initial experience can be rated zero.