Appeal against fine

[Ros19]

My son was fined chf 240 for not having a valid ticket for a bus ride (ticket price chf 2.40) when in fact he had bought a ticket using the app. E version he has installed on his phone is in my name because he is a minor (14). He had a valid ticket but it was in my name. The fine seems unjust, and even if we accept he did not have a valid ticket,  grossly disproportionate. How can we appeal?

[VlaznimA]

Hello @Ros19 

I recommend that you contact the Revenue Service Center. For this purpose the following information:
SBB Service Center Einnahmen - Zurich
SBB AG
Personenverkehr
Zentrale Einnahmensicherung
Postfach
8048 Zurich

0848 00 11 33 (Mon - Fri 8.00 - 17.00, local rate) or fahrausweiskontrolle@sbb.ch
+41 51 225 90 03 (only for customers from abroad)

I wish you a pleasant day.

Greetings, VlaznimA.