Security is the responsibility of the account holder, not Bungie. If someone hacked your account and altered/removed your previous characters etc, then they are simply gone. Bungie does not restore lost or deleted items/characters.
It's not what you want to hear, but that's simply the way it is. Make sure you enable 2FA on all your platform accounts, change the passwords on all platform accounts, and change the password on any associated email accounts as well - since if they have access to that then they will just find out your new security changes.
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I've recovered the account, and I only have access to it, but it s happening several times, the game itself erases my characters, it happened right now. Destiny knocked me down and when I got back on my characters, they were deleted
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The game does not delete characters. And for it to happen twice, you need to stop giving your password out, plain and simple.