Car world sells accident damaged Vehicles

Sales people lie to you regarding the condition of their cars. The make promises that their cars are in immaculate conditions and that they have been for Decra tests. Problem is the Decra test they do is the roadworthy which doesn't show much except that the car is roadworthy. They sell accident damaged vehicles and upon inspection if you ask them if the car was in a accident they say "not to our knowledge" but upon inspection you can pick up that their cars were clearly accident damaged.