Free Cable Kit for Respironics Dreamstation Go and 3B Medical Luna

I ordered a cable kit for my Pilot Lite CPAP battery for my Airsense 11. The company sent a kit for the Dreamstation Go / 3B Medical Luna. When I let them know they promptly sent me the correct cable kit, but they don't want the one I can't use returned. I'll happily send it to someone for the cost of postage.