Sdmc — Neighbour causing mischief

Address:

765 f/s rajouri garden near police station

How do I solve my problem with our neighbor when they repeatedly throw dirty water in our colony's park while washing clothes.

Either way it sounds like they’re throwing dirty water in my direction which is unseemly and obnoxious.
They do this twice a week and whre the water goes is the main entrance to the park and my home

We have asked them very politely to not to continue the act but they dont listen and threaten us to file a complaint.