This company sent me a broken piece of equipment, ...

This company sent me a broken piece of equipment, and offered a refund if I sent it back. The issue is, USPS came and picked-up the monitor based on a scheduled pickup that I set up, and now they are saying (over a month later), that they haven't received the broken piece of equipment that came in a damaged box. Instead of pursuing the post office, I basically gave them free money.