OneDayOnly order processing sucks!

They have some interesting / useful stuff on their website. BUT: Have been TOTALLY unable to order anything because I go through the entire process of placing my order, give them my Visa card number - CVV number - and the site goes away and thinks about it - and then rejects the order because my card expiry date is invalid. Check with my card supplier - and the expiry date IS correct. So I am about to become an EX OneDayOnly customer ...