Discovery Miles refund

I ordered a Cycle Lab voucher on 19 Dec for my wife for Christmas. I phoned the next Monday to find out when I will get it and they said that I would probably get it after Christmas. As the vouchers was not issued yet, I requested it to be cancelled. The Call Centre agent said that the Discovery Miles would be refunded to me within 2 days. That would have been the 23rd of December. I have phoned so many times and subsequently the courier pitched at my house twice and I send them back as I already bought the bike. Every week the call centre promises that I will get the refund, but up to today nothing has happened. The integrity with which Discovery Card and the Vitality Mall is handling this is shocking and not how I have come to know them.