I hired a contractor to do some concrete work and tuckpointing. The job is unsatisfactory and I found out later that they used subcontractors for everything. They are refusing to refund and can't guarantee they can fix the issues. When I asked the foreman if they used subcontractors he said no but later the owner admitted they did. I asked for a waiver of lien and they refused until the work is done and after I pay the remaining 50% balance. This is in Illinois.