Hi Darth_Doggy,
I know this can be frustrating, but regrettably we don't have any power to influence clans and leadership/ownership. You can always try to see if unlinking your Call of Duty account, clearing your web browser cache and cookies, and relinking your account may help. You can also check either in game or on the Call of Duty mobile app to see if you may have leader privileges and can transfer the ownership temporarily to another member and have them remove you and invite you back. The reason that moving between clans may have caused the issue, is that the app data may have recognized you in multiple clans, and removed you in an attempt to rectify your status. Hopefully this helps, if not I fear you may have to start a new clan.
Thanks,
^AJ