Sir bank has power power to create alien on the other properties to secure loan though they are separate loan.under 171 Contract act
171. General lien of bankers, factors, wharfingers, attorneys and policy-brokers.—Bankers, factors, wharfingers, attorneys of a High Court and policy-brokers may, in the absence of a contract to the contrary, retain as a security for a general balance of account, any goods bailed to them; but no other persons have a right to retain, as a security for such balance, goods bailed to them, unless there is an express contract to that effect.1 —Bankers, factors, wharfingers, attorneys of a High Court and policy-brokers may, in the absence of a contract to the contrary, retain as a security for a general balance of account, any goods bailed to them; but no other persons have a right to retain, as a security for such balance, goods bailed to them, unless there is an express contract to that effect.1"
But in case you have sold the property vide a agreement and received consideration for the amount and paid off one loan of the bank the third party interest is created in the property, though a mistake on your part that no written sanction from bank was taken by you for sale.
Now first of all raise the issue before the CMM court vide an application for release of house paper as third party interest is created for paying off the house loan and you were bonefide to sell the property to pay off the loan.
If you did not get any relief from the CMM court file a writ before High Court seeking direction for the bank to release the documents.