Dialing up her phone from a fax with the number withheld and pressing redial each time it reaches maximum re-dials can be satisfying (I'm told).
I've got great neighbours on three sides, regrettably one of them doesn't understand that their two boys continually shouting at the top of their voices, whilst playing football in our common driveway area is not "Boys will be boys" it's being an inconsiderate neighbour - the older they get, the harder they kick against the wall, and it goes right through our house.
-Pity though, a nice couple, I'm loath to fall out over it.