wrong account ?

So basically, it seems like my Email address has two account linked to it because of Xbox ? and when i try to buy the Minecraft dungeon game. i can't connect to this account cause the user name i get is While Death, whise is an other of the user name i uses when ti_bud is used. could anyone help me with deleting or making sur that when i buy dungeon i don't get it on my While Death account but on my Ti_bud ? please and thanks you.