When you redeem a reward, you are exchanging your points for the reward. You may have accidentally redeemed a reward, or you may want to save your points for a larger discount. In this case, you need to reach out to to the store's customer support to see if they can refund the points for you.
Can I undo a reward redemption
As a customer, can I cancel a reward redemption so I can save my points for a bigger discount?