A sub-subcontractor is filing a claim against us for non-payment by our sub-contractor. A Notice to Owner was not filed nor was a lien filed at all. We were not aware of this contractor until we received a demand notice 137 days after final payment to subcontractor. We do not have a release of lien, unfortunately, but we do have a receipt (issued to us from subcontractor) from sub-subcontractor with Payment in Full and date. We also have a contract with the sub contractor stating all workers work directly under subcontractor and subcontractor is responsible for paying all wages, taxes and other expenses. This is an electrician and no permits were pulled either. Sub Contractor states he paid sub subcontractor in cash.