Well, in order to delete your account, go to UCP and delete character account if delete character account is disabled it means you don't have 16,000 or more in your account. You should have 16,000 to delete your account then after clicking Delete character account, go to your email and confirm the email from RCRP to delete your character under 24 hours you'll recieve a E-Mail that your accounts are deleted.
Indeed, as mentioned above. If you notice a significant delay in the confirmation (72 hours or so), you may create a support ticket in the user control panel. Kindly refrain from making character deletion requests in the Help Section.