What year coach do you have and what type of hinge. Sounds like you have a side opening door versus top opening.
you have 2 options if the door is not fixable.
1-Buy a used one from salvage yard if possible. RV Exterior Body Panels Used RV Parts For Sale | rvexteriorbodypanels.visonerv.com
Visione deals in these if they have one that will work but you will still have to get it painted.
2-Take it to an auto shop that is capable of making a new metal cover and then painting.
On my 2002 Windsor my wife hit a post pulling out of a fuel bay. The post was the right height to crush the top hinge on 3 of my bay doors, damaged a portion of the bottom of the slide, scraped 2 doors at the bottom, and damaged 1 door pretty bad. I got a quote for a small door from Visione, $500 and I would still have to paint. I did buy 1/2 part of the top hinge that attached to the RV. The 1/2 of the hinge that attached to the door I bought from Monaco.
I was able to fix myself with the hardest part being to straighten the small door and then repainting everything >>> 3 different colors with design. I used BASF Diamont paint, got the color codes from Monaco.
Although I can tell where the damage is most people can't tell it has been fixed. Total cost was $250 for the hinge pieces & $200 for the paint. +20 hours of labor was free.