Hello Weenokeaph47
This is one of the few exceptions that a Saver Day Pass can possibly be refunded after purchase. In order to refund your existing Saver Day Pass, you must first purchase the new pass. In the refund request, you must declare the ticket number of the new pass. Both passes must have the same date of validity; furthermore, the traveller’s personal data must be identical.
See this page to initiate the refund process:
https://www.sbb.ch/en/help-and-contact/refunds-compensation/refunds-compensation/refund-form.html?stepId=3.8
There is no guarantee that the Saver Day Pass is refunded. The decision lies with SBB and the respective department in charge. An administration fee of CHF 10 per request is applied in case the request has got accepted.
Kind regards,
Roland