There isn't a way to directly contact Bungie. If you didn't save the code, you won't be able to order it anymore.
English
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I saved the code, but the store says it’s not valid. And I know I saved the code because I still have the email.
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Sorry, I mislead you. The deadline to order ended Sep. 30. Did you order by then?
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Yes, and it’s when I first put a request in for help.