Neighbours abusing my young minor child with foul verbal abuses

Greetings! We are residents of a gated society. Our neighbours are constantly provoking us, intimidating us and calling us all sort of foul-mouthed cuss words each time we are at home and we go in and out of our house. My daughter is a 15-year-old minor girl who suffers from a spinal cord tumour. The lady neighbour loudly pokes fun at her ailment and uses horrible, swear, slang and atrocious foul-mouthed language, verbally abusing my daughter as she goes and comes to school. She and her 27-year-old son threaten us with physical harm She also calls me and my husband obnoxious names whenever she sees us. she has defamed us very badly in the society that we live in and this has caused us immense pain. My school-going child has been under constant fear and emotional trauma due to all these wrong rumours and foul language. It has impacted her health and her studies as she is under constant fear and has been mentally and emotionally traumatised. The cops, I suspect are acting partisan in this matter, even after we have shown them all pieces of evidence against this family. Please help us, especially my young daughter. Please advise.