Treble damages are imposed on rent overcharges by the DHCR. I was not aware that the DHCR had any jurisdiction over agents--or that treble damages were imposed on illegal agent fees, for that matter.
Unless someone here has more info, I would suggest going back to the SOS office to ascertain A) The basis of DHCR jurisdiction and B) The statutory basis for pressing for treble damages. I wonder if maybe the courts (small claims, perhaps?) might be a better venue,