Remove Bungie.net Account Completely

 

 Bungie, Inc. is an American video game developer located in Bellevue, Washington, United States. The company was established in May 1991 as Bungie Software Products Corporation by University of Chicago undergraduate student Alex Seropian, who later brought in programmer Jason Jones after publishing Jones' game Minotaur: The Labyrinths of Crete. Originally based in Chicago, Illinois, the company concentrated primarily on Macintosh games during its early years and created two very successful video game franchises called Marathon and Myth. A West Coast offshoot produced the PC and console title

How to Remove Bungie.net  Account Completely

TL;DR you can't do it. Discussion at http://www.bungie.net/en-US/Forum/Post/66636671/0/0