Ok, I'm in my third year of college with a major in Chemistry so take this for what it is. Room temp oil on the belts/hoses should cause little if any damage. I spill oil on stuff all the time, I just take a rag and wipe it off. It could knock a year off the half life of the rubber used on your belts, something that won't matter at all. The belts would become worn way before they decayed. Although, in your case the oil could have been (and probably was) at temps that would cause damage to multiple things in your engine bay including rubber belts/hoses. I'm sure the contact areas are now weaker than the areas that the oil missed. The belts and hoses are now dangerous due to the fact that the rubber is not at a consistent strength. Like suggested before, I would have the bay cleaned by a different shop and bring the bill to the dealer. I would then request that the dealer replace EVERY piece of rubber or plastic that was contacted by the direct oil spray. This may sound a little crazy but as posted earlier, damage was done to these parts. The oil was VERY HOT and under a lot of pressure. You saw what it did to the belt that broke. This should have been enough evidence to have all the other ones replaced. Compare it to running boiling water through a 2400 gpm pressure washer and then shooting your big toe. Trust me, it didn't do any good...

My opinion:
I would not let that dealer touch the car ever again after they correct what they did. I would also send the pictures to chrysler and tell them the same thing you told us. The dealer should have treated you like a god and done everything you said after an incident like that. If this dealer is 5-star they could easily be cited for this. Chrysler will probably send you a bunch of free crap, too. I agree with a lot of the other members, REPORT IT!

Sorry for all the grammatical and spelling errors. I can do math and science but I write like a high schooler...