You can check how you are doing with each challenge in your Única private area. In the "Mis Recompensas" section you can check the refund that corresponds to you for each challenge met, as well as the refunds of the Rewards Plus Plan to which you are entitled if you contract Netflix together with Única.
With Única, we don't keep your savings. We give them back for you to enjoy. You win, and so does the planet.