Cheating case

Facts of the case: My father runs a supply business with Sands and stone for construction. He made a supply agreement with one contractor. He made the delivery with the order placed by the contractor. However the contractor without paying the full amount of the supplies, ran away without informing him. The crucial thing is that since my father is illiterate, he had no idea of written agreement or to obtain it as to produce as proof/evidence against the said contractor. Is it okay to file a formal complaint before the Police on the basis of Cheating case? kindly help me...