during the business deal, cheque was issued to the party, the payment of the cheque value has already been transferred to the party's account (through bank transfer). yet the party has presented the cheque to the bank after altering the date of cheue. one the first time the note from the bank was "signature required" and cheque was sent back to the party. second time the same cheque has been presented to the bank after altering the date of the cheque.
how can i protect my self from the leagal issues against that cheque.