I decided to not bother with the email form, so just called them instead.
Firstly they verified that I enrolled into the offer, selecting the $10 voucher.
Then they asked for details of my shop, asking if I purchased any tobacco or gift cards.
Then they asked more specific detail from my docket, namely the store id, transaction id, time of transaction, total amount. Luckily I had the docket with me.
They then told me that they'll mail me a $10 gift card
Worked out in the end, but would have preferred that they just get it right in the first place.
Interestingly got an email from EDR today stating:
EDR said:Hi John,
We would like to let you know that due to a system issue, you missed out on receiving a saving of $10 from our ‘Choose your own reward’ email offer.
To make it up to you, we have credited $10 to your Everyday Rewards card for you to use the next time you shop. Your credit will be available on your card, number 9344614015403, to redeem at your convenience between Monday 2 February and Sunday 15 February 2015.
I wonder if I'll still receive a gift card? Though I doubt it.