Gift card cant be used as payment with a promotional code

<p>ZANDO has not made provision to insert a gift voucher code at all if there is a sale on. This is absolute nonsense as a gift card is in essense cash - you have received the cash already but you will not let me use it on what i want to purchase!!!!!!! CALL CENTRE SAYS THERE IS NOTHING YOU CAN DO. <br /><br />WHAT ******* AND THEIVERY! </p>