Dishonesty dealership

Bought a second hand car fro Jambo motors in February this year. The dealership did not disclose to me that the car is an accident damaged car. They had a Dekra report and only said the had minor cosmetic repairs on the front bumper. Believe you me the car looked new and all that, less than a month i started experiencing problems. It started with an oil leak, then when it rained the car would be full of water in the inside. The car was obviously badly damaged on the left sides, where the whole problem is. The shock mountain started revealing a welded crack in may. To my assessment, there has been major welding done on that side leaving holes that let water inside the car. Now am living in prayers that it doesn't rain whilst m on the road. Unfortunately, i have known of this platform after buying. I have noticed there are other people with the same mater as mine on the same dealership(Jambo motors). **** Dekra reports, they will tell you of minor cosmetics where as the car is badly damaged.