Had my camera fall out (again when simply closing the boot).
Fortunately I found the lens assembly (the bit that fell out). Potentially this could be glued back in, but Seat obviously advise against this (something, something calibration, something, something water ingress). The car was 2 months out of warranty, so Seat washed their hands, the dealership simply looked uncomfortable being the messenger of bad news and claimed to offer a reduced cost replacement (trust me, it is not cheap).
If Seat won't honour as warranty, I'd explore third party (as poster above promoted)
Fair to say, I won't be touching another Seat again, or VAG car for that fact (shame as I used to drive Skoda's before this car)