I received a preliminary notice from a supplier for one of our subcontractors. When the subcontractor was final paid I sent him an Unconditional Waiver of Lien to notarize and sign and also requested an Unconditional Waiver from the supplier I received a preliminary notice from. He sent back the Unconditional Waiver from his company but said he didn't use the supplier so no lien waiver. Now what? SI received the preliminary notice what do I do?