I just bought 4 day pass and got worng valid date, what can I do to change that?
You can request a refund online via the contact form on sbb.ch or the SBB Mobile App. You can find help here: Refund of tickets purchased online and via mobile | SBB help & contact
If you have questions about tickets and travelcards you can find answers in our help and contact area: Overview | SBB help & contact
Have a nice day,
Kind regards from Brig,