Oh, my, that's ugly .....
That's a shame.
I don't think a PDR person has a hammer that big ...... but, you may consider having one look at it.
If they can beat it out and re-spray it, maybe $2,000 (USD)
If they decide to replace the rear quarter panel and replace the door, then spray it ....... oh, that will cost enough to make your insurance rates go up.
My friend, Bubba, says he can fix it with his toilet plunger, a piece of 2x4, a BF rubber hammer, a bit of Bondo and a rattle can of paint for about $300 (USD)........
humfrz