Booking not possible

We had a presentation a while a go and received a free holiday voucher for this regard. I struggled to register the voucher on the one year gift voucher website and sent a mail to [Email Removed] and received an anonymous reply with instructions unable to assist me. I reset our password on the site and logged in. When I went to the bookings tab, I saw that our voucher has already been booked/used?? There is no telephone number where you can talk to a consultant and the system does not want to reload this voucher. How can we get a used voucher? Very dissapointed with the lack of service. :(