Hi @VBFKU
Thank you for your request.
Concerning your fine «Travelling without a valid ticket» please get in contact with the responsible department.
SBB Service Center Revenue - Zurich
SBB AG
Passenger Traffic
Central Revenue Services
P.O. Box
8048 Zurich
Phone: 0848 00 11 33 (local rate/Monday - Friday 8.00-17.00)
Internet: sbb.ch/en/rogf
Greetings and have a nice day/ NadineS