Not so much the scrappy 4c, but the spend to reach the $30 threshold.
I'm positive you could buy a mobile recharge
and as long as it was more/= $30
you got the fuel voucher ( in most states)
Reason i ask is i shopped the other day with groceries and no docket was offered.
Terms and conditions
^To receive a fuel discount of 4c per litre, spend $30 or more (excluding purchases of gift cards, lottery, smoking products, carpet care, donations, travel cards, tickets and delivery charges) in one transaction at a participating Woolworths Supermarket or Metro and present your fuel discount receipt or scan your registered Everyday Rewards Card within 28 days from issue at any participating Ampol sites or participating EG Ampol sites. For full terms and conditions, visit everydayrewards.com.au/terms.
Did you scan your rewards card? They are saved to there.