When the holder of the cheque receives information from the bank that the cheque has been dishonoured,…

Section 138 proviso (b) requires the written payment-demand notice within thirty days after the payee or holder in due course receives bank information that the cheque was returned unpaid. This is distinct from the drawer's fifteen-day payment period after receiving that notice under proviso (c). The thirty-day notice rule was already applicable in 2016.