Take pictures of the car and get an estimate for repainting the damaged hood. You ought to inspect the rest of the car since the "overspray" or whatever is not likely to be limited to your hood. They damaged your car and are responsible for correcting it. Once you determine the extent of the repair cost, confront them with a certified letter. If they don't pay up, go to small claims court. You'll win. Probably get a few hundred $ or more.
That having been said, once you document the loss, you can try to remove it with clay. That works for small dots. Bigger stuff might let go with GOOF OFF or other similar product. Use it on a hidden spot on your car first to test to see if it causes major damage to the paint.
Good luck. keep us informed on your progress.
E