Your dealer is full of sh*t.
I have personally adjusted 4 hoods that the guys said dealer wasn't able to fix, and its fairly simple:
Loosen the front latches from the frame;
Loosen the hood brackets (where the hood holds to the frame, 2 bolts on each side);
Play around with the hood closed until it falls into place with no stress on the brackets, and tighten the brackets. Unlatch the hood and check if it unlatches correctly. Open the hood, and latch it again making sure its easy to latch.
Tighten the front latches on the frame. Recheck latching and readjust front brackets if necessary.
Once the hood is adjusted, then adjust the bumper if it looks a bit sideways or off.