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I did the same thing (booked 1 day off). I sent an email 1 week ago but I have not received a reply. I do know that they sometimes take a couple of weeks to reply. I asked for a change in dates.
I took a train last October from Santiago to Madrid and at the train station took the "Metro" to the airport. The metro fare is included in the train fare. You need to show your train ticket and get the subway ticket. It worked well for me.
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