I've drained the $200 Biz Plat via the "book and promptly cancel" approach and now have a -$200 balance sitting on the Biz Plat. Am I right to think that it's asking for unnecessary eyes on the account to call and ask for the negative balance to be shifted over to another card and that I'm better off just making $200 worth of charges on the Biz Plat, or have people made that call without it being a big deal?