How to handle this

This person has parked their old sedan in my reserved spot multiple times. I finally left a note that said “please remember that this spot is reserved and someone else parks here.” I technically lifted the windshield wiper to fit the note under. Other than that I didn’t touch anything. Then I hopped in the shower. Two minutes later I hear banging on my door, and then heavy beating. I called my complex’s courtesy officer and considered calling the cops. Then I got this note.

The beating/kicking (?) on my door was so hard that I don’t feel safe. I was really scared the door would come down. The note seems threatening. Should I just ignore this? The person lives right below me so… we’re in close proximity.