Fraud Case againt me and my father

Hi, • Mr X has account in nationalise Bank. Mr. X had issued a Cheque of 10 lac rupee to my father in 2012. At the time of issuing cheque nothing was written on backside of cheque i.e. backside of cheque was blank for sure. • My father had submitted that cheque for clearing. • Once cheque was cleared and original non CTS instrument was returned back to issuing branch via clearing house for records, it seems Mr X has managed to access that cheque ( apparently through illegal process) from bank’s archive and had written some sort of fraud agreement on back of cheque in 2014 stating that we have also received 10 Lac amount as cash along with cheque and if we agree to term mentioned in agreement then only we should place cheque for clearance. • There is no signature on that agreement which is written on back of cheque either by me or by father. Also there is no written agreement in place. • Now using this fales cheque as proof of that agreement Mr. X has filed a civil case against my father and lodged a criminal 420 complaint in local Police Station recently. • Police had called us and recorded our statements for his complain on 420 case. Please note that Mr X had also filed a civil case for stay on further selling that property which is now in my uncle's name for which civil court has already issued order that in prima faci MR X case is not valid and rejected his application. We have also given copy of court order to Police.