I'm a small contractor and I have a signed contract with homeowners for work performed. It includes price of materials and labor. They paid half on the labor and for all of materials. Now they are refusing to pay final payment on the labor. The job is complete to great standards and looks excellent! They are refusing to pay me because they feel I didn't spend that much on materials which they agreed to. I filed a notice of commencement with your company but what else should I do? Please help me get what is owed to me! Thanks!!