We have a buyer based in U.K who has been promising us payment of goods he asked us to consign to him.He keeps issuing false t.t on with bank details and each time these do not materialise. He targets small exporters in developing countries.He starts by giving advance then after 6 months he asks us to consign goods to him and then he falters.We are around 12 exporters who have been targetted by him this year. Pls advice how we should proceed.