Oh my goodness, what melodrama.
It's nowhere near time for the police, or the opposite extreme of "getting the boys around to 'ave a word."
This is simply a matter of one of the neighbour's workmen overstepping the mark. The chap needs putting in his place by his employer, the neighbour, or to be fired and replaced by a more civil window cleaner. If the neighbour won't help then more serious measures may be needed - but not yet.