I have 2009/59 astra, just a few hours ago i was parked in gear on a hill, i was by the car which was locked, heard a click and it rolled down the road and hit a wall, it has cause 600 pounds of damage and have reported faults to vauxhall about the gearbox and brakes, but as always " no fault could be found" i have cctv of the incident, is this likely to.help me prove the car was at fault?? They should pay as the has failed at something as simple as standing still