Olx India — car ad

This is in regards to car ad which was posted on olx by om cars. This om cars are car dealers who regularly post on your portal. Because olx was involved and we saw the car on olx so we bought the car. The car after being used for two weeks only have been found to have missing sensors from day one. When we went yo dealer he said i can't do anything. Why can't u block dealers from posting ads on your portal and avoid customer to be cheated. Remove there ads immediately and take action.