Stop Client driven migration

This is an old post But there was never a response and I would like to know how to do this? I tried searching but couldnt find another simillar post. We turned on client driven for one of our remote sites but it's hogging so much bandwidth i need to shut it down. I disabled the users for client driven but i stil have about 20 users whose status is "migrating". I want to just kill it for these people as we are going to import manually now. But i can't change status to "do not migrate" now that it's started.

Any Ideas?