deletion of actors from an episode they don't appear in

I tried deleting two actors (Yeardley Smith and Timothy Williams) from an episode of Brothers (Sam's Dad, Ep.#5.20) in which they don't appear, and are not listed in the credits either. The request to delete was declined, for the reason "We can't verify this". Understandable, because you probably don't have the episodes on home video - but I do, and the actors don't appear. Can this deletion be done another way? (The note about the deletion being declined said I should visit the Help area, and look for another way to contact IMDb - and that's what brought me here.)