6 months complaint not being resolved

My store is placed next to a gym and Broll thought it was a good idea to divide a store and the gym with a rhino board?? The loud music leaves my staff and customers with headaches daily as the music is very unpleasant its been 6 months complaining about the music that sounds like we are locked into a box! The sound proofing placed is not working! Bad bad experience i am having with Broll, the property manager communicates with me in a condescending way. The Operations manager now does not answer my calls. My lawyer has sent them a letter of demand which was ignored! In my lease agreement in stated not to play music that disturbs other tenants yet other tenants are allowed to disturb my business? I am losing customers daily because of the loud music from the tenant next door! There are certain services i am unable to provide to customers in the store because of the loud music from the tenant next door! Broll just doesn’t care! Iv never been late with my rental! Iv spent alot of money on tenants improvements/ deposits! Not even worthy of a 1 star!