As a Govt. Organisation we got a few DD/Pay Order from different Exporters/Importers as Inspection fee. The DDs were deposited into our accredited Bank within validity period. However, after somedays bank returned a bunch of DDs citing expiry of validity period. Now, we can't find the Exports/Importers to do the revalidation of instruments. In this position, please confirm about how to gets the pay-orders/ DDs revalidated officially?