Our General Contractor previously offered in writing, verbally, and written on invoices delay credits AND offered in writing, verbally and on invoices covered expenses that accrued without our knowledge (and only being informed of after the fact of their completion). The relationship soured towards the end of the project and now he has generated a fraudulent invoice to include these fees, charges, and expenses that were previously in writing, verbally, and noted on invoices as being not part of the owed expenses for renovation. He has threatened a mechanic lien on residence. Do we have a case to prove intentional and willful fraud?