ماذا يمكنني أن أفعل ضد جار يستمر في خدش سيارتي في موقف السيارات؟

Take a picture of the door how it is now or complain to the security.

You can also go to the police and ask the security to testify on this and be a witness or make him put cameras as an evidence.

The last thing you can do is ask a different parking place.