My Bank Guarantee has been expired on 10.10.2008. It was given as a performance gurantee in favor of Municipal Commissioner, LB Nagar against the contract awarded. The contract was terminated in March 2010. I have a dispute with the departement. I have given a legal notice to that extent. I have asked the Department to give back the BG originail as it it is expired and no use for them. They have not responded. I have approached the Bank to discharge my BG. They have asked for Original BG. I have informed that is not necessary as the BG is already expired long back. They have told that it is certain that we will not invoke the BG after expire date; but dicharge the BG original BG is required; that is the Bank Rule. Anyy body advise in this context. Is there any such rule either in Banking Laws or in legal paralance?