There are repair shops everywhere for this type of thing, they call them refinishers often enough. They can sand out the marks, or depending how deep will fill them with a putty material, hardens, repaint or powder coat etc. if its too bad they wont repair it as liability.
Just google wheel repair in your area. im sure you'll find them. Actually quite affordable, had a whole set of wheels refinished + powder coated for $500 in my area.