Someone was saying to me that you can't get the 50% discount on the website, you need to use the app. This was after I'd already got the 50% discount from Geneva Airport to Sion.
Anyway, what he told me seems to be true of certain journeys (he's travelling from Zurich).
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So, if anybody else is having trouble getting the discount try using the app.
Ya have to book a single journey, then back again to guarantee a supersaver ticket price!!
If ya booking for more than 1 person, best to do it separate for each person.
I booked for individual tickets as panicked that no tickets left and had to get the last train back from Sion to Geneva airport!!
I e-mailed the train company as I wasn't happy what I had paid for our four! After 3 e-mails back and forth they have refunded my original money and I have booked the cheap tickets.