Had a schedule change this morning on a connecting flight through ATL. Schedule change pushed my layover to 5.5 hours. Not happening. RUCs cleared months ago for both flights and got on the phone today to get it sorted out. Original agent told me since it was an involuntary change I would be cleared into First regardless of availability on a new flight. Was put on hold while she worked on it and was transferred to a new agent. New agent then told me it would be $500 for the change. I explained the earlier agent told me it would be an even exchange into F since I was cleared and an involuntary change. She continually told me that’s not the case and had to waitlist me into F on the connecting flight in ATL. What’s the deal here? Was the first agent correct and the second messed up my itinerary? Or was the first agent mistaken?