Carrier/rack problems of the 2010 Lexus RX350

I was pulling into a parking spot at my workplace at very low speed and the Lexus accelerated wildly over the curb onto plants and iceplant into a tree, which stopped the car. The hood was dented, the grill cracked and the bumper was ripped off both sides. I took it to the dealership immediately. The edr was supposedly checked by a 'neutral' third party and I was called by the dealership to come pick up the vehicle and the factory would respond in writing in 30 days. Unacceptable.