WRONG FSL DONE SIGNATURE OF CHEQUE WITH CHANGED SIGNATURES

In my case a person given a cheque for Rs.1 Lac bearing his signature. this cheque returned unpaid with insufficient funds remarks. we have sued him under section 138. accused filed fir in separate court that sign on cheque and account is not opened by him so direct the police to send this cheque to fsl. He also said that account is not opened by him this is opened by me. police sent this cheque & a/c opening form opened bearing sign done in 1987 (when his age was 18 years) with completely cha