Tough to prove it was them without being certain of before/after. I had a VW Tiguans door handle break off, took it to the dealer to get replaced, I saw the technician take the whole door off and lay it on a table. Took them a few hours so I went away... Came back, picked the car up and drove home, when I reached home I saw a dent on the door, up high, in the middle, like it was placed on something.
Went back to the dealer, manager came out, said it could have happened anywhere, and not their problem without proof and walked away.
Once got a chip in the previous Golf, found a good window place in sauga that said they will fill it for free. The tech drove it into the garage, and backed it out later when I came back out of the waiting room, When I got home, the rear bumper was all scuffed, like it hit a dumpster, which was outside the Garage. Again, no proof, so SIL. Lesson, always look before and after, take pictures.