Hello HU XIAOYING
Unfortunately, the SBB Community is not the customer service, it is a customer-to-customer support platform; consequently, we cannot treat your request as made here. Also, for privacy reasons, you should not leave personal information here as they could potentially be abused; we will mask them.
Please send your request, including the ticket number of the obsolete pass, as well as of the used pass, to the customer service using this form:
https://www.sbb.ch/en/help-and-contact/customer-service/praise-comments/reklamation.html
Refund requests of your kind are treated manually by a staff member; due to Christmas festive season, the processing might be delayed. Thank you for your patience.
Kind regards,
Roland