A former tenant has filed a construction lien on my property he used to rent in retaliation for not renewing his lease. He now fraudulently claims he worked on the property as a handyman and was never paid. He is not a licensed contractor or a sub, no NOC was ever filed, no permits were ever pulled, he wanted to paint his room and got my permission to paint and I supplied the paint for him. He also took the liberty to do minor repairs on his own, fix outlets etc. without permission and to install patio enclosure without my permission. He now claims he wants me to pay nearly $12K for the work he was never allowed to do and recorded a lien. What should I do?