If you bought a Woolworths Gift Card through Cashrewards you will have received a saving on your purchase, is there a chance that you had the Woolworths Gift Card website open and forgot to click through Cashrewards? 

Otherwise, it's worthy to note that there are two Woolworths stores on Cashrewards (excluding Woolworths Mobile). In order to get a saving on Woolworths Gift Cards, you must click through the appropriate store page located here 

Cashrewards also offers Woolworths.com.au located here, which has a different Cashback scheme to Woolworths Gift Cards.