Salutations drweasel12,
I understand that you've been removed from the clan as a clan leader, can you try unlinking and relinking your gamertag on the Call of Duty website? Creating a new Call of Duty account with a new email address, may also help. You can also check to see if a clan mate was placed in charge and can invite you back or transfer back ownership. Let us know if that helps!
Thanks,
^AJ