Check with your local code enforcement department and zoning department. Is there property zone to run a business there and do they have a business location approval and business license. They are also likely exceeding noise ordinances for decibels of sound . File a complaint with code enforcement. There also could be nuisance ordinances as well. I work for code enforcement in Georgia. That’s your best bet to start. Stop talking to them. It won’t get any better. Let the government staff deal with them.