Online Store issues

Why is it every time it want to order something from the Square-enix online store I have to create a new account?

http://store.na.square-enix.com/stor...ryID.63256100/

Attempting to get a PS4 copy for cheap and neither my FF14 account nor my other 2 accounts I have created to order will let me log in to place an order. But I am able to make yet another new account and get my items... Seriously? And of course the support number for their site will not help me unless I give them both my username AND password? Seriously, I am not giving my password out... Yet these are the people who sell your merchandise? REALLY?