We hired a designer from Missouri to install vinyl plank flooring in our home in Kansas, and now the subcontractor wants more money than what the contractor paid him. The sub-contractor threatened to place a lien on our property, if we, the owner of the property, don’t pay him what he wants. We have not yet received a bill from the sub-contractor, but we have received an invoice from the contractor for the remainder of the job. How is the sub-contractor allowed to practice extortion in this manner?