Neighbor creating nuisance in every aspect

I live in a bungalow society. Our neighbor is a set of two 45 year old jobless brothers with criminal background. They are continuously harassing my family in different ways. They tie their dog near our fence for the whole night and the dog keeps barking, disturbs our everyday sleep. The poop and dirt of the dog is often moved through the fence in to our garden. They use an old water heating equipment technique where they burn everykind of waste, plastic and tires to heat water, creates very bad air pollution. Their coconut trees have been damaging to our property and the dried branches keep on pilling up in our garden. Their taps are often open & water is wasted for the whole night. The flowing water enters our property and over waters everything in our garden. There is also a lot of dump and waste stored in the neighbor's garden giving rise to rats, mosquitoes and other insects. We have conveyed all these issues to the neighbor to no effect. They often use fowl language, bad words and threaten us when we tell them about these things. They have even attacked us at times. We have lodged a no of complaints againts them with the police. All the other neighbors also have issues with this neighbor, and many of them have lodged FIRs against this neighbor. But still they are continuously creating nuisance and challenging us everyday with bad words, castiest comments and much more. Can't we have a permanent solution for such nuisance? We have already faced many damages emotionally & financially because of this. Please suggest the cost of legal actions if considered or any other solution.