How to remove your Bandpage account
Bandpage collects all kinds of information if you sign up using Facebook. Revoking the app from Facebook doesn’t necessarily mean all your data is removed from their servers as well.
To be certain, uou can contact them via http://help.bandpage.com/customer/portal/emails/new to have your data completely wiped from their computers.
For more info on closing accounts, read this: http://help.bandpage.com/customer/portal/articles/589501-how-do-i-remove-bandpage-from-facebook-or-cancel-bandpage-plus-
Helpful Trick: Removing online data
Helpful Trick: Remove third-party logins
If you signed up for Bandpage using a third-party login such as Facebook or Twitter, you probably want to revoke all access from Bandpage. Click here to find out how.