Does the manufacturer have a Facebook page? If they do, you might get some attention there.
I recently bought a gold bracelet for my wife from Macy's. It broke. It was defective. Several online chats and phone calls with Macy's. I was told, sorry, you're 11 days past the return period and there is no product warranty. I posted a comment on their Facebook page and shortly thereafter, they offered a full refund and paid return shipping.