Characters can only be manually deleted. Bungie will never delete them. If you did not delete them, then someone else did on your account.
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All my materials and guns in the vault are still there is there anyway I can bring my characters back. Cause all my guns that’s were on them are deleted. Secondly what should I now do to secure my account?
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Unfortunately not. The link I provided above will give you steps to up your account security.