re: How much will it cost to fix this damage on my car?

Take it to a good body shop--approved or not. You only pay $500 regardless. They can't tell you where to take your car. The approved places will put used replacement parts on the car if that is what the insurance says. Take it where you will get brand new parts--insurance has to pay for it, they just try to get off cheap. Don't let them scare you by saying you might have to pay more if you don't go to one of their "approved" shops.