We can understand how frustrating it must have been to be expecting a discount and having to pay something in full at the end. Unfortunately, based on our terms and conditions (T&Cs), no retroactive use of the voucher/promo code is permitted. Vouchers/promo codes cannot be refunded, redeemed or exchanged for cash too.
However, if you think this is due to a technical issue, please submit a request to us.
You may view the Order ID at "Bills" in your Atome app or screenshot the entire order page to us