I spoke with Greg (there) about filing a construction lien on a client that has not paid for partial services I did, before telling me they were going to use some one else. I have written notice to proceed (emails) as well as further email asking about progress, etc. After completing a portion of the agree to services, they told me they were going to use someone else to complete. I told them I would send an invoice for the percentage I did, and then did so. They replied they did not think they owed me for the services now, so I filed a Notice to File a Construction Lien through Levelset. I then received an email from their attorney with somewhat distorted information that must have been provided by my client, but basically said if I do file the lien they will file a lawsuit for slander of the lien. I told them the facts remain the same; they asked me to do something, I did some of that, they changed their minds, I invoiced for that portion, they said not paying. What are my options now? Still file?