Paid amount through a mortgage deed but cheque bounce case filed

House constructed by a contractor who has claimed a case that total calculation of construction has a pending amount of 6,00,000 to be paid. By a section 138 act of cheque bounce. The cheque was given by the owner of the property before returning the money. And infact have paid it and registered a mortgage title deed that states " received by the lender amount of 6,00,000 by cash. After this the owner has asked to return the blank cheques as they had now returned the money but the lender denied to return the cheque and progonged it saying it was of no use and that he would return it sometime. The owner ignored it as they are family relatives. Hence the cheque was not cancelled. But now the contractor has stated that the owner issued the cheque a month ago and on.presenting it, the cheque has been bounced. And that the owner is liable to pay the 6,00,000 which the owner has already paid through the mortgage deed.