I'm so sorry you're experiencing this.
Obviously you're not the one who feels this way seeing as though the cops showed up.
Just FYI, if the kids were above curfew age and the cops didn't see any crimes being committed, without someone who can testify as to what they saw, the kids won't be charged with anything.
"Anonymous" complainants are very common, but do little to help us if we get there and nobody's there or nobody is doing anything wrong.
Good luck, stay safe.
Keep all doors and windows locked. This goes for your vehicles too. I've taken SO many reports of burglarized vehicles where the person not only left valuables in the front seat of the car, but also left it unlocked.
Times have changed...people have to realize this.