One wonders if they removed the ability to pay for the taxes, surcharges, and fees with points, which is what I did on the tickets I bought when I emptied out my RBC Avion account 3 years ago. This could be one of the other reasons why the OP feels mislead.

The agent at Carlsson Wagonlit offered me this option when I made my reservation, as I had some 300K points in my account I was trying to burn. Perhaps her points total was too close to the bar to do so, therefore the subject never came up.

I do hope the OP is acquiring these tickets on a carrier in which she has a frequent flier membership so she can collect FF miles as YVR - ATH is a pretty good accumulation round trip, assuming ATH is the final destination.