Hi Beatricebritt
The way I see it, this is a case of “International passenger rights | SBB” and you should contact our customer service directly, as they are responsible for this matter.
For your contact via E-Mail: customerservice@sbb.ch
Of course, you can also contact us by telephone Mo - Fr 8.00 - 17.00 h on 0800 401 401 (no additional costs).
Have a nice week, EllenvS.