Board Thread:Question and Answer/@comment-28468151-20161014231435/@comment-25151790-20161014232522

You need a third device to do a proper account swap. See Account Transfer for details.

To get your account back, you will need to contact support and follow their instructions to regain your account. They will likely ask you for details from your account, especially important are your Support ID and current number of jewels.

To contact support:
 * Menu > Support > Support > (scroll to the bottom) Inquiry Form, select "Game Data Transfer", and send a ticket