We have been working on a multifamily project in NC for months. Since day 1 they have consistently gone to 60 days. Our contract states we have the right to place the GC on credit hold and no longer provide labor or materials until the account is brought current. They refuse to pay the 50% retention that is at 63 days and are at 40 days on the last draw. They now have threatened to terminate us if we do not finish without payment. What are my options? Can I lien for the remainder of my contract? Are they not in default of the contract, not us?