At any time after the principal money has become due, the mortgagor has a right, on payment or tender, at a proper time and place, of the mortgage money, to require the mortgagee (a) to deliver to the mortgagor the mortgage deed and all documents relating to the mortgaged property which are in the possession or power of the mortgagee, (b) where the mortgagee is in possession of the mortgaged property, to deliver possession thereof to the mortgagor, and (c) at the cost of the mortgagor either to re transfer the mortgaged.property to him or to such third person as he may direct, or to execute and (where the mortgage has been effected by a registered instrument) to have registered an acknowledgment in writing that any right in derogation of his interest trans ferred to the mortgagee has been extinguished: Provided that the right conferred by this section has not been extinguished by act of the parties or by decree of a Court." In Raghunath Singh and others vs Pt.