And I’d be suing the tree trimming service in small claims court. They have an obligation to make sure the person ordering trees cut has the legal right to do so. I might also put up some surveillance cameras watching the property line and recording on a 24 hour loop.
Depending on the number, age, nature, etc., of the trees, I seriously doubt small claims court would be the venue.
However, I'm sure the guilty HO's property insurance won't be too happy.
Besides, if the abutting neighbor lies about an unmarked (save for the trees) property line, who's to say before the damage has been done?
While I generally wouldn't "damage" others property, I'd get a cash only, illegal alien gypsy service to do the work.
I once had a fight with the town over "their" tree rubbing against my house. I had to trim the offending branch myself. Morons.
Even the power company fought with them. They ended up "splinting" the sections of power lines that were subject to rubbing against the trees.