Conditional waiver and release on progress payment form was attached to all invoices and the final 2 have not been paid. What actions should we be taking and what is the timeline we have left to request payment. We are licensed and bonded painting contractors. We sent out 1 late notice using certified mail and have proof of those letters being received and signed for by the owners, but it’s been a few months past due at this point and we have not received any communication or payment.