EDIT: This post was sent as the OP posted the one before.
Kevin, I think you will need to get Kobo to delete the shelves on the Kobo end. Open a ticket with Kobo help. Their official support forum is
https://getsatisfaction.com/kobo. You can email Kobo for help at
help@kobobooks.com or you can call them, see
http://www.kobo.com/help/customer-care-phones/#NA.