Expunging all billing info from an account

Is it possible to remove all billing and personal information from an existing paid account?

If not, is it possible to close an account and have all traces of billing and personal information removed from the Linden Lab system? (Obviously, I am only interested in current billing information that pertains to me and my credit card. Things like transactional history is not a concern, as long as it is free of personalized information.)

You could downgrade your account to Basic and clear out your CC information and change your personal info as well if you wish. That can be done via https://secondlife.com/account/