locked as in ?

Forgotten you wow id and pass or game time expire?

If your game time expire just buy any digital copy and key in the code and you are good to go.

if you forget you account you can use ur original cd-key to verify as the owner of the account with further info with the cs

i guess owe them. I am not sure how do you even owe them as the credit card is charge before you get subscribe. Sound fishy to me that blizzard cs asking digital code from you. better double check the website you visit.