Refused cash refund

My daughter bought a handbag at Sole Candy but returned it because there were pen marks on it. On returning it she was told that they don't do cash refunds only vouchers. They did not have another one of the same bag and nothing else that she liked. Nowhere in the store is their refund policy displayed, only on the sales slip. Obviously when you read it on the slip it's too late. I went back to the store wanting to speak to the manager, who wasn't there. The one sales lady was incredibly rude and kept putting the music louder while I was trying to speak. I eventually spoke to the manager on the phone who also refused to give my daughter her money back. According to the CPA the giving of vouchers is not illegal BUT if the customer wants their money back the store cannot refuse. The voucher is only valid for 6 months so if my daughter does not find anything else in the store that she likes, she loses her money. This is totally unacceptable and I insist that the store refund her in cash. Somebody needs to do something about their unfair refund policy.