Damaged car; no accountability

Daniel delivered our sports car a day late and covered in an inch of dirt. He asked my wife to sign a form that it was delivered. It was in fact a contract waiving liability for damage. As soon as we washed the car, we saw long scratches parallel along the roof of the car-- deep enough to cause rusting long term. Daniel claims 'you signed the release, I am not liable.' Daniel is not an honest business man, and he did not work with us to resolve our damaged vehicle. He told us 'my deductible is too high..'