They'll only give you a refund if you have the receipt.要有收据他们才会退款。You can claim a refund provided you keep the receipt.你要有收据才可以要求退款。Any person who wants a refund must have a receipt.凡是想要退款者必须持有收据。If you retained a receipt, please enclose a copy of such. 如果你留有收据，请附上收据副本。