The delete character feature has for a long time caused accounts to get stuck. Unfortunately you need to wait for a CSR or GM to unlock your account... I believe it is because the delete character procedure has a bug in it from the server merge. Are you on Syntax by any chance?
Send a PM to TSRJasonC with the account name, character name, server name and last 4 digits of the credit card used to pay for the account (assuming it isn't paid with game cards or that international payment option ... whatever it's called), and he will unlock it for you as soon as he gets in on Monday.