If you want to cancel your google authenticator (2FA, OTP) please send a message from your registered email account to firstname.lastname@example.org and ask for it to be cancelled.
Please let us know which coins you have with balance and 3 of the latest deposits with the corresponding transaction ID and amount. Send all this info inside the email when you´re requesting to cancel 2FA.
I may sound a bit confusing, but this is only to prevent that it´s really the owner of the account that is sending us the request.
Security comes always first.