How can I help the following elderly in this scenario?

Dear helper, I live in a society. In the house opposite to me lives an old uncle and his wife along with one son.The uncle used to work in a factory but due to some accident got paralyzed partially.So now he lives at home all day. The son goes to work whole day. During this when the aunty goes out she turns on her radio in her balcony at an astonishingly high level to harass the uncle. He is paralyzed and can't go upstairs. We have many times tried to talk with the aunty. But she replies in very vulgar words and we are unable to do anything for the uncle. She many times gives us warning that if we try to interfere then she will call cops on us and will lodge a fake sexual harassment complaint and will take us to jail. Even woman members of society are scared of her. Its been 6+ months and she does this daily and it seems the society people are now ignoring the condition. Is there any person who is responsible for senior citizen welfare whom we can take this case to? How can we help as the Old uncle is not our family member? Me and some society people would really like to help him but we don't know how to. Thanking in advance.