I hired a contractor to install new windows and siding, and rebuild front deck stairs and replace decking with composite materials. The project was about $115k and I have paid about $100k. I got a letter from the lawyer of the building supply company that they were putting a lien on my house because the contractor owes them $58k for the windows and siding. Do I really have some fault here if I have already paid for the contractor for the windows and the siding?