How can I lien the house,I am a general contractor, naive and good nature, my business partner and I have been tricked in signing an addendum as the investors calls it but when asked if it was a list of things that still needed to be done the answer was yes bu the list included something that was never part of the scope of work, the installation of the floors that someone else already did the job, they insist for us to give them credit so 12,000 dollars. in a way they want a very expensive present,