Jul 24, 2016 - 6:24 PM
in reply to premj
An upgrade, no. I have never heard of that. The only option I know of is to cancel the pass through the retailer you purchased from (usually a 15% fee applies), and then get them to issue a new pass.
If you come back to Switzerland in the future, please be sure to visit this page before deciding on any pass. It explains how to pick the cheapest pass based on your plans. In your case it seems like the 15-day pass would have been cheaper, even though you don't stay for 15 days. It's quite common actually. Many people buy an 8-day pass even if they stay for 6 or 7 days.
Anyway, I hope you'll have a wonderful time in the Alps!