Hello Balgrog23
Thank you for your message.
saver offer Flex tickets cannot be refunded (even with the 30-minute rule). For international tickets, the fare will be refunded according to the tariff.
With saver offer Flex tickets, exchanges are generally possible up to one day before the first day of validity, but refunds are not possible. You can find the conditions on your ticket or here.
If you have any further questions, I recommend contacting the SBB Contact Centre directly on +41 (0)848 44 66 88 (CHF 0.08/min.).
Have a nice weekend.
Best regards, TatianaR