This vehicle belongs to my friend, but I was the injured party. She was visiting me and realized she forgot her phone,.the vehicle wias at the top of my driveway and in park. She wanted to go back in the house to look and got out of the car & left the door open., I leaned into the car to press stop engine and immediately the car began to roll down the hill, dragging me 50'. Car still in park slammed into the stone wall of my garage.I had injuries to my right leg. aplit lip, frctured nasal bone, nerve damage to my thigh and torn meniscus. The Ambulance arrived, I was taken to the hospital and treated. Witnesses signed affadavits confirming vehicle still in Park. I have not been awarded any compensation since they say that my injuries were not serious enough.Mazda,at this time, has refused to take respomsibility since they could not duplicate the incident remotely tested by a Calif.facility. I am reporting this incident because all other parties have failed to do so.