No stock and no refund!

On 26 November I ordered from Zando. After 7 business days I enquired about my order but received no response. I called the number provided on the website but after 10 minutes I ended the call as I was placed on hold the whole time.The next day I received an e-mail saying that the 2 items are out of stock and the order was cancelled. I followed the link to the Jeep shirt and it was still available at a higher price. I was e-mailed two voucher codes for the refund. After sending another 2 e-mails, I still haven't received feedback. I requested that the money be refunded to me. I don't want a voucher as I do not wish to buy from Zando again. Please refund me my money.