Might be targeted but received this email from Coles:
You may have experienced a technical issue at checkout, when shopping online with us on Thursday 1st of June. We know this is not up to scratch and the issue is now resolved.
We would like to offer you a credit of $20 on your next online order*. Simply place your order by 19 June and enter the promo code CREDIT20 at checkout.
Not sure if there's minimum spend, my total order was around $80 and successfully applied promo code.
Targeted for those that might have experienced issues