bought a vehicle that was involved in a collision and this was not disclosed by the dealership

I recently purchased a pre-owned Honda Brio 2016 from the Claremont dealership. Unsatisfied with my vehicle i sent it to Dekra for inspection where it was found that I had been sold a vehicle that was involved in a collision. I have referred the matter to the principle manager, pre-owned manager and sales consultant . They swopped the vehicle and gave me another unsatisfactory vehicle of which I have also taken back(2014 model). My concern is also that I was sold a vehicle that was not even inspected by the workshop, putting me and my family in danger. This whole deal has been such a drag if I have not traded in my vehicle with them I would seriously cancel the deal. Is it common practise of Honda SA of cheating people of their hard earned money.