If you signed an order of payment and were never paid within the specified time-frame, then the lease should be null and void. If they filed it publicly, then that is unethical in my opinion, since you never received any sort of consideration. The reason for orders of payment is so they can get your lease and have 60 days to "flip" it to another company for a profit. They likely never had the money to begin with and would only be able to pay you upon "flipping" it.