[BigA]

It looks like PDR should work on that, I had a PDR guy take out a dent on my Titan from a shopping cart behind the rear wheel and you can't even tell it was ever dented. I know my dad had a much worse dent on his Subaru door that he had PDR'd and I'd say its 98% good, you have to look at a certain angle to see anything.

 

[BigA]

Trying calling your local Mercedes dealer, around here the biggest company called "Dent Wizard" got bought out by Mercedes and you have to go through them to make any appointments, might be the same around you

Almost all car dealers use a PDR guy, some are better then others, I was recommended to a Chevy/Cadillac dealer and I think it was a Dent Wizard.