Automatic Transmission Control Module problems of the 2005 Hyundai Santa Fe

My 2005 Santa Fe (Hyundai) was parked in my driveway. My 3 year old son got out of my sight for 2 seconds got into the car and put it in reverse and coasted out of my drive and across the street hitting my neighbors Ford expedition. No keys and he is too small to reach any pedals. This was almost a devastating accident, there where children riding bikes on my street and a car driving down the street . It is almost a week now and I am getting nowhere with Hyundai, and the dealer tells me they cannot do anything until Hyundai inspects the car. Since the incident, I can still put the car in any gear without keys or touching pedals. And the steering wheel is locked so you cannot steer either.