I had house built in 2002 by a contractor. He sub-contracted some if the work out. When the house was completed he took the final payout from myself and the bank. He came back later and said I owed him money for one of the subcontracted jobs. I am trying to sell my home and found out that he took out a mechanics lien for $7k. I have the paperwork of all the payments, how can I dispute this?