Sounds like you paid $24 for a locker to me. You sent them money, they sent you a locker and some money back. If they don't want to take the money back from you, then don't bother giving it.
I recently bought some Powerstop brake rotors for my D60 on Ebay (not PORC). The company sent the wrong rotors, which arrived a week or more later than they SHOULD have. Well, a month and a half later, I got the correct rotors, which SHIPPED AFTER they had refunded my money ($68). They also sent a call tag for the incorrect rotors to be sent back. I gave them to my buddy that works at UPS and he dropped them off for me. As for me, I still have two free brake rotors sitting in my basement. I waited almost two months for them, (yes, they were Buy it Now), and they were sent after my money was refunded, so that is THEIR problem, not mine. I haven't gotten an e-mail saying they want the money or rotors either.