Sorry to read what shocking treatment you’ve had from that company. I got ripped off on a promised wheel refurbishment some time ago and never saw a penny from the insolvency but the company was back up and running under a different person but discontinued there wheel refurbishment service. I hope you get a better result in the small claims, couldn’t the damage done be classed as criminal damage as it’s clear the car was neglected in their so called care.
There are panels on eBay but ? If right silver, and probably might need some paint to bring up to standard. Hopefully you can get some acceptable quotes to rectify the damage done to yours. At least one positive that your car is running great as reported in your journal