Regarding Loud Speaking & Noise by Neighbors

Hi, We are common working class family of 4 living in our own individual house. Our neighbor however is a jobless 35yr old married fellow, who has stolen a steel bench from somewhere and put it outside our house. Every night from 10pm onwards, he sits there and plays music on his cellphone, his other jobless friends accompany him and talk and laugh out loudly cracking jokes on lewd topics. This goes on every night till 1-2am after which he goes to sleep. So basically this has become a mental torture for us as it has become difficult for us to sleep at common sleeping time of 10-11pm. We are frustrated as we have to wake up at 6am again for getting ready for office. He has reduced us to only 4hrs of proper sleep every night. Lack of sleep is affecting our productivity and our life has become miserable. We have politely requested him to removed the bench and stop this nuisance. But he has arrogantly refused it. I know there are laws regarding loud speakers not to be played at night. But is there legal way of making this go away. Pls help.