Hello vipt2000
Thank you for your request.
Normally, Saver Day Pass are not exchanged or refunded. But there are always exceptions when buying new tickets. You can make your request by phone on 0848 44 66 88 (CHF 0.08/min) or by e-mail to ticketshop@sbb.ch.
I wish you a nice afternoon.
Best regards,
JulieL