Ask Smithy Xtra Chipped paint problem

When I got it home after having my one-year-old Mazda 3 Maxx Sport serviced I noticed a large area on the bonnet where the paint had been chipped away. I am positive the damage happened while my car was in the dealer?s care, but their response was that bird droppings caused it, and it was not their responsibility. I cleaned my car the night before taking it in for the service and there were no droppings there then. They also advised me that the heat in the engine activates the acid in the droppings, which eats at the paint and chips it away. I didn?t find this answer acceptable. Do you think I should take this further with Mazda?