*****/negligence -vehicle registration

I bought a brand new vehicle from this dealership and the service was not great at all. When I went to pick up my number plates, I was given a copy of the vehicle registration documents, and I instantly noticed that the ID number and name was incorrect. I queried this with the dealership and I was advised tbt Jason Diaz( the sales person) that this would be rectified and it still has not been resolved and when I called the dealership no one is able to provide a solution as they claim Jason is no longer with them