Not intending to prick anyone’s balloon but I heard of a similar case where tenants got nowhere with a landlord and property management company when seeking rent reduction. Mediation got nowhere (if it took place, I don’t know,) and so they went to NCAT asking instead for the right to break the lease without penalty, given their “suffering from noise” which was not disputed.
They got their wish.
Lease terminated two weeks later with no penalty for the tenant to pay.