Underhand and ********* tactics from dealership, Poor quality of service rendered

We bought a demo vehicle from a delearship, upon further inspection of the vehicle, we noticed that it had a couple of chip marks on the front bonnet, chips on the windscreen, and paint marks on the rear bumper. Furthermore, when we inquired about the spare key, we were told the spare key was lost and they would place an order for a new spare key. All of these things were not discussed prior to signing and taking delivery of the vehicle. I have liaised with the dealer in question and they are not helpful. We have returned the car for them to correct, and it comes back with same issues. The attitude of the dealer principle of the concerned dealership is distasteful and very threatening and disrespectful. When we discuss these issues, he takes the stance that we must call our lawyers and the ombudsman. The quality of service received from the dealership leaves a lot to be desired.