i had a new wrx in with the dealer for a service a few years back..
was told car won't be ready for a couple of days, asked why and told, flat out haven't had a chance and i accepted this as they had given me a loan car.
picked it up 2 days later, all good $200 odd bucks.. oh by the way they said..we bumped ya car when we were parking it, got a minor scratch but we have repaired it, you'll never notice.
i checked out the bumper and couldn't find any thing and left it be.
6 months later i took it in for a service, they said after, oh u been in a stack, no i said.. oh really, three panels don't have data dots (part of subarus security system).
they went on to deny any wrong doing on their behalf and i got legal advice but it became he said she said and no evidence to prove anything.,,.
only thing i will say is i never had any drama with the car