I had a house built and my builder hired someone to build the fence. We signed an agreement that I would pay the builder after closing on the home based on the estimate he provided. He wouldn't send a copy of the invoice or receipt of the job. I found out the contractor he said did the work, actually did not do the work and I have that in writing. He won't tell me who did the work or if it's under warranty but expects me to pay what's on the contract agreement we signed. If I don't pay him, can he put a mechanical lien on my home if he didn't actually do the work himself?