Don't forget that... Once you have purchased your season ticket and before travelling, it is essential that you book and obtain your ticket for the day and train you are interested in. You can do it through any of Renfe's sales channels.
All Avant (mid-distance high-speed) passes can be cancelled free of charge as long as you have not made any transactions with it. If you have already made an arrangement, but have not yet travelled, you can cancel it with expenses (15% of its price).