Car Damage

How do you feel about someone hitting your car and doing damage to it and then not letting you know about it? We discovered the other night that our bumper had been hit and hit hard and cracked it almost completely down to the bottom of it on one side. It also damaged the lining inside the bumper by the wheel. It knocked out a whole piece, part of which contained a bolt that held the bumper to the liner. So the bumper was kind of swinging loose. We called the insurance company and took it in and got the estimate and took it in for repair this morning. Lucky for us our insurance pays for a rental car as it will take 2 days to fix. We will have to pay the $250 deductible since they hit us and ran. That makes me mad.