Had some difficulty using this service and also trying to contact them for a refund for a card not sent.
Apparently it turned out to be my fault which I found out after they contacted me following a poor review I left.
They should make it easier to contact them to avoid poor reviews but it just shows how leaving a poor review will get you a refund quicker than complaining direct.
I have amended my review to 4 stars as they are now refunding me.