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1. If it ends on July 22nd, then you received a suspension not a ban. 2. Not sure why you would share info with people (even friends, this sounds kinda fishy). 3. They won't discuss bans or suspensions, so all you can do is wait it out. Not really sure what was posted. I have never heard of someone getting suspended from a "fire team title". Again, are you positive that was the reason for the suspension?
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Nope. Just gotta wait it out. This is one of the risks taken when others have your account info. Bungie/forum mods has no way to tell who it was, so they punished the account that made the posting infraction. Otherwise, everyone would just say “it was my friend/roommate/etc” to not be punished.