I am sorry for you but lessons of tresspassers I have learned.
1. johnny law doesnt give a #!@& usually doesnt even respond considers it too petty for them.
2.Tresspassers are all low life scum and repeat offenders. tresspassing is just std op procedure for them.
3. When caught and confronted they turn rude vulgar etc etc.
4. if not properly made unwelcome they will come back again and tell their scum pals.
5. they should be made properly unwelcome, HOW thats up to you!
6. if made properly unwelcome they will tell their scum pals and word will travel that your place is very forbidden fruit.
7. if they see the game cameras they will steal them or wreck them, that I promise you.
8. if left unchecked their mayhem may increase, you may get broken into next.
I have seen and or experienced all of the above.
Good luck to you item 5 & 6 usually works wonders!! lol