You should be able to get a refund (though they can certainly offer you a replacement instead and see if you'll accept). Even when a purchase order states "no refunds, returns, or exchanges," that does not apply when you are provided either the wrong item or broken/defective item; that policy means that in the absence of a significant problem with the order, you cannot voluntarily choose to return, etc., it. However, you are not required by the law to accept a nonconforming item; since the dress was nonconforming (damaged) you should be able to cancel and receive your money back if you chose.