This happened to me twice with my mk6
The first time a headlight was replaced under warranty as they scratched it during PDI - they then proceeded to damage my bumper while refitting it and reversed my car into a chair while I watched through the workshop window.
Luckily the car was undamaged but I got 1x set of GTI mats, a tank of fuel and a meal for the family which I put a receipt in for about £100 and got it
During its first service (at a different branch) the mechanic Kerbed my wheel and cut the tyre
They denied it but the scrapnel was still all over the wheel so couldn’t deny it
For that one I got another meal out, another tank of fuel and a new alloy and tyre
When I took the clubsport in for its service they were given the riot act and they were certainly on their best behaviour!