That's weird, it should be done already. May I request you contact support at [email protected] along with the screenshot and your YouTube Channel ID (UC0yrZgjVyMewphLP1VcDVRQ) please?
As today is the 30th day that you requested the unlink for it could take until Midnight tonight and then be updated for you on your YouTube dashboard from tomorrow morning. If this has not happened then please feel free to contact our support team to check up on this please