Automatic Transmission Gear Indicator problems of the 2004 Dodge RAM

I put my truck into park to run in and pick up my dry-cleaning ( was inside maybe 60 seconds) came out to find my truck gone and after looking I find it across the parking lot. It had jumped the curb went through their landscaping and hit a tree damaging the rear bumper,tailgate, bed side and dually fender. After going back in the cleaners the lady that works there informed me that her new Dodge truck has done that to her before. This is the 3rd time this truck has done this to me and it is not a year old. The first time I figured it was my fault but I started paying closer attention, the 2nd time it was in park with the "p" lit up and got about 2 stepes from the truck when it started going backwards but caught it before anything happened and now this. I have contacted Dodge and they are supposed to send someone out to look at my truck??? we'll see!!!.