"...they'd simply pitched tents behind our house and occupied the hammock hut without asking... make a new firepit 4 meters from an existing firepit and use firewood I spent weeks collecting..."
The nerve of them, especially after saying they did not want to rent the hut! 😣
Did you consider running them off at that point?
I was so angry I couldn't even talk to them, but we took a pic of their licenses plates for future reference. We will have to make a wall of shame somewhere one day.