Really disappointed with the service I received. I...

Really disappointed with the service I received. I bought an used vehicle and they delivery with an incomplete service as agreed in the purchase contract. I had to make an inspection of the vehicle with the department of transport and they concluded that the vehicle was not roadworthy. I waited a month to hear a response from the dealership and they just reply to me when I decided to sue them.
To be honest I expected more professionalism and honesty with this company.