@Nitin Agrawal: Basically a notarised sale agreement is not valid in the eyes of law. Further what you stated is taken to be fact that you have already given Rs. 10 Lakhs, the sincere advise would be to take it back, because since the property is mortgaged to bank and also a dispute is pending in the high court, you will not be able to get even a handful of sand from the property. The bank as mortgagee has full rights over the property, even the seller has lost his title until he has redeemed the mortgage. Therefore before being cheated more, better take back the amount already given or face the music for not being careful.
Further, if at all you want to post your query open a new thread and post it don't use others thread.