Found this on my Coles Online homepage:
$15 off every shop
Use promo code SAVE15X210R
Min spend $210Terms & Conditions
* Offer valid for specifically selected customers only at Coles online when you spend the required amount or more in one transaction, after savings and discounts and excludes smoking and tobacco products. You must enter the specified promo code at checkout to receive the discount. Offer is valid on every order placed between Wednesday 1 August and Tuesday 14 August 2018. Cannot be redeemed in store or for cash. Normal delivery terms and conditions apply see shop.coles.com.au. . Promo code has been made available to specifically selected customers only and cannot be used in conjunction with any other offer.
Was advertised on one of my account but it worked on both accounts, so you may be lucky.
nice