If they are using the same Error code from 1.0 the 601 is because some bit of information (thought could be incredibly small) is not matching between your SE account and your Debit/Credit card information as it is set up with your bank. In my particular situation it was the smallest of small things I did not have a middle initial with my SE account but did on my bank account information. The awesome part is you can not change your name on your SE account. Luckily I work for my bank and know how these "checks" of information on cards works and had my bank take my middle initial off the system and Voila!!! I had contacted support to figure out what the error meant and that was how I figured out what to do.

Funny thing is I asked them.. so what if got married and changed my name? Then what would I do? The guy told me I'd have to send them documentation so they could change it on my account for me O.o I haven't set up my sub yet but I know the main reason this is a problem was because they pull name and address info from your account info instead of allowing you to type it all in. Before all you gave them was like card number, expiration date and maybe cvc code? so if the other verification info (name and address) is different on your SE account then what your bank has you're going to get this error. Address you can change on your SE account Name you can not