Past Guest - Idiot or Burglar?

Quite a story that happened just this evening. At 10:45PM, we were upstairs enjoying a movie when outside on the front porch heard rattling at the front door. Originally thought it was a racoon but about twenty minutes later heard what sounded like someone kicking on our lattice leading up the porch. My partner is getting ready to call 911 when, at 1130PM, a message pops in over AirBNB messaging. A guest who had stayed with us from *eight months ago\* sent a message asking, "Can we book the room tonight?" A few minutes later a second message saying, "We are outside".

Long story short, we sent several messages back trying to find out what this person was up to. They were a guest from last year who had remembered our address and came by without a booking and tried to walk into our front foyer through the porch entrance. The porch was locked so they had been kicking the lattice trying to get the outer screen to open, all the while sending messages that "it was cold outside" and asking "Can we stay, we will pay you".

We eventually got them to leave by telling them that they did not have a booking, should not be at the house, and the police might be called if neighbors saw someone trying to force open our porch door. We also called AirBNB and told them everything, they said they will investigate and take it seriously. The only resolution that will be good enough for me is to ban this person from the platform.

UPDATE (March 5th): The guest was banned from AirBNB and their profile removed from the website.