Once you have cross-save activated, no accounts can be linked or unlinked without disabling cross-save. And disabling cross-save will incur a 90 day cooldown period before you can reactivate.
You’ll have to either deal with the cooldown period, or deal with having a wrong account linked. Double checking account details before activating, is always wise.
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Bungie staff does not have access to our account info, as it requires our private login credentials to login to those accounts. They cannot make any changes to our linked accounts in the background. Please read the cross-save FAQ, and you’ll see that the 90 day cooldown is standard for any deactivation, and that linked accounts cannot be changed while the feature is active.