I don't know what you mean by "we". Every blog has a single blog owner and it is the person with the username account who registered the blog and purchased the upgrades for the blog. To renew the upgrade you must be logged in as Admin under the exact same username account that registered the blog and purchased the upgrades for it.
Clicking this link should display all your blogs registered under the same username, including the hidden ones: https://dashboard.wordpress.com/wp-admin/index.php?page=my-blogs&show=hidden
If you do not see the blog here http://en.support.wordpress.com/my-blogs/ then
follow this guide > http://en.support.wordpress.com/my-blogs/#my-blogs-dashboard-visibility
If you have lost your log-in information you can visit https://en.wordpress.com/wp-login.php?action=lostpassword
and if required click the "Need More Help" link and complete the form for account recovery.