We are on a job for casework in progress, almost completed. We did a partial billing for 23,000. Sent the invoice. There was some type of bank cyberfraud that tricked the contractor into paying this amount, unbeknownst to us, to a Wells Fargo bank account in California via wire transfer. We tried to help the contractor stop it by calling every department we could at the banks, but due to rules and regulations, the bank was unable to freeze the funds so the money is gone. Our company has a Chase bank account. They still owe us the money and we are getting feedback they don't think they owe it because of the fraud. I need advice on whether that is grounds for filing a lien.