https://www.desidime.com/discussions/is-there-a-way-to-identify-how-many-dcb-rewards-points-will-expire-in-next-6-months?page=1#post_9226759
call cc, or there is one trick - create voucher and let it expire, after a month RP will be credited back to account with fresh expiry
By chance I found this, and CC also confirmed same - a year old info so needs refresh