Who would I contact to get answers to my question and isn't someone responsible for the damage to my car?

I was going under an overpass one day on my way to New York (I was still in NJ because I didn't pass the Lincoln Tunnel yet). And what I though at the time was mud hit and splashed the side of the car, the front and back windshield, as well as the front bumper and the back on the side of the truck. Their were men on the overpass so I didn't put two in two together that it might be wet cement. A couple day late, I wash my car and the gray stuff that was all over it would not come off. I washed my car three times and it still would not come off. So I went to my kitchen and got a Scotch-Brite 3M Non-Scratch Scrub Sponges( I looked it up because I could remember the name of it). Anyway, I went to scrub the cement off of my car and it would not come off. I started to use my nails and scratch the cement and it started to come off a little bit, so I wet the sponge and used the back side, the green side, and it came off. I started at the front on the hood, and did the front windshield and that came off too. It took about ten minutes to just the three spots on the hood and the windshield. They weren't big spots, but it was hard to come off. The spots I would say were the size of the quarter or probably a little bit bigger. I took a break and when I came back I started on the couple of the spot on the back, side near the back side window. It took some scrubbing but two of the spots finally came off. When I checked the front and then the back the car, I noticed that the spot was scudded up and scratched and the car was discolored where I scrubbed it. I was pissed off. Not only will the cement not come off, but now on the few spots that I tried to get the stuff off it is discolored and scratched. After that, I gave up. There are still spots all over my car, window and front bumper. I don't think that I should just eat this. If I decided to sell my car the value will probably go down because of these scratches. Not that my car is new or anything, but it was in good shape before this incident. My car is a gray 2002 Volkswagen Jetta GLS.