What can I do if the car I purchased has defects and I just want my money back?

I purchased a used vehicle on Aug 7th, I had to wait a day to get it because the water pump had to be fixed. When I picked it up I noticed a crack in the windshield while driving off the lot so I immediately turned around and told the dealership. They stated to come back another day. Four days later, it broke down due to being overheated. I took it back that day they claimed they did not see anything wrong and that it was probably an air pocket. I took the car and returned it a week later to get the windshield fixed. They kept it for a week. Then called me to get it, when I asked if the repairs were made, they told me no. I explained that I wouldn’t get it until the repairs were made. What I later found out from the bank was that they had not paid the dealership and wanted five references from me. At this point, I did not want the car anymore. Now also because I was registering the car in PA they gave me a temporary plate but it was only good for 20days. So by the 27th 20day s after I purchased the car it had broken down again I let it sit and took it back the 27th the day the plate expired and it’s been sitting there ever since. I do not want the car or any other one from them. I want my money back. Besides requesting five references, they keep telling me it will be considered a voluntary repossession and it will damage my credit. What can I do?