We were hired by the GC for concrete work. We hired a person to help us with the concrete work. Initial work and price agreed at $8500. Unfortunately, the scope increased and the said person increased his pricing to$11250 ,which was too much for us. He threatened to quit at an important time by trying to force our hand to paying him $1500 to proceed work the next day. This $1500 was not agreed upon initially. We felt we were taken advantage of and refused what he asked. He did not come back to finish the initial contract the next day forcing us to find another crew. He contacted us back saying he was owed $1500 for work done even though an initial $4000 was given already and threaten to put a lien. The GC has not paid in full neither the work has been completed entirely.