As your train was cancelled, you have in prinicple four options by the passenger rights, two of which for you might be interesting:
- The interrupted journey no longer fulfills its journey: Total refund of ticket price (not recommended) This would then mean you have to buy new tickets.
- Keep on travelling with next reasonable connection: Reuse or exchange your ticket for a ticket valid on a later train or day. If the total delay is larger than 60 or 120 minutes, a monetary compensation will also be made. (very much recommended)
The default procedure for that would be to either ask for what to do in person at the station (the office opens at 8 am) or to call the SBB Contact center:
Tel. 0848 44 66 88
(CHF 0.08/Min.)
From abroad: +41 848 44 66 88
Note that you are not entitled to refund of taxi costs unless you are told to take a taxi. In no case are you entitled to get compensation for missed flights and other follow-up losses due to train cancellation/delay.