Nothing can be done. They have no information about your account details. That's private info that only you had and decided to delete.
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So what can I do? This is an issue I have.
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It is an issue you created by deleting a linked account. What can be done about it? Absolutely nothing.
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Nothing. Bungie can't unlink it despite what Google tells you. You deleted the acct. If Google can't get the acct back for you then the acct will remain linked to your Bungie acct