You just bumped into RENFE's site the worst piece of crap ever designed. If you plan to stay in Madrid for 5 days, I'd head to the nearest train station and get the tickets in person. There shouldn't be any availability problem.
You will have to take two trains I'd guess. One to Barcelona and then one to Girona. Not sure though.
You could call them but I doubt they speak any english. Here's the (normal wage) phone number for reservations: 954 487 620.
It isn't free but cheaper than the 902 number for which you pay extra.
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