You are correct, I went back to seat selection and they just changed the configuration. Our seats had changed by the way , we were not even sitting together anymore . So if I understand correct there is economy and economy plus. I tried to change the seats to economy plus, it lets me select the seats, and then of course at the last step it says seat non existent. Is there a fee for this? I won't be able to (or should) use my eupgrades, right?