MY UPSTAIRS NEIGHBOR MAKES CONSTANT BANGING TRYING TO INSTIGATE A FIGHT. I CALL 311 AND 911 AND WROTE 3 LETTERS TO THE LANDLORD AND STILL THE NOISE CO

It is your landlord's responsibility to intervene and  neighbor is not a nuisance to you. If necessary, you landlord should start an eviction action against your nuisance neighbor. You may also withold rent but should not do so unless you retain an attorney.