Bungie is unable to help you with this.
You need to work with Sony to recover your account without this account you cannot change anything on your Bungie account.
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Why they can't just delete my Psn account from my Bungie account?
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The authentication system is there for security reasons and as such Bungie will not remove the account for you for any reason.
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With the ability to authenticate that account Bungie cannot and will not be able to help you.