Customer Unfriendly Refund Process

I bought some clothing on my Ackermans acc but i lost the slip and i needed it be refunded back to my Ackermans as i don't want the cash for it but was informed that Ackermans dont refund without a slip even if you have a account with them. They cant even give a statement so that you can trace the purchase, i know that you can refund without a slip which is not redeemable for cash and i dont need cash just refund back to Ackermans account.