Landlord Tenant

The landlord is uncooperative and is delaying the repair work at his flat due to which there is water seepage in my flat which is right below his. The tenants who live in his flat are the rude and bad mouth, my mother, loudly because of seepage. They called her idiot, nonsense, made comments about her clothes. As a result, my mother who is 58 years old suffered from psychosis. I've the medical prescription for that. She was unable to bear the trauma that someone is talking bad about her when she is so soft-spoken and never raised her voice.