I am a senior citizen 77 years old, I have been harassed by the someone in my apartment,

I am a Female/ & Widowed, senior citizen 77 years old, I have been harassed by the people in my apartment, I have a flat above me and they have 2 kids who play all the time, I have tried telling my owner and the apartment watchmen to communicate to the flat above me, But my owner and the watchmen are afraid of that person cause he had already verbally and physically threatened and attacked them in the past, after i telling them they have made it difficult for me to live there, i a unable to have a peaceful life as they are always banging the floor with heavy things and sometimes for no reason just like that till the early hours of the morning, I supposed just to irritate me or make me more uncomfortable, Even after me plugging my ears with cotton or ear plugs I am unable to have rest, So i travel 2-3 Kms to my daughters house to have some rest and then come back. Is there anything else that I can do, cause I am really helpless and when my son comes back at night he gets very disturbed and we have arguments regarding this issue, I tell him to keep quite and may be it will resolve, But due to School holidays Its really unbearable, Please please suggest me a way out. God Bless