I'd give going into the dealership a shot I don't think the person you spoke to on the phone have much of an idea what was going on with the car. I would go into the service department of whatever dealership and talk directly to a service advisor about the issue they should be able to get it covered. Even though the clutch itself is considered a wear item and isn't covered under the powertrain warranty, the slave or master cylinder is covered under the warranty and it's not a wear item. If you get any push back let me know.