TER SNCF
If your train has been cancelled, you must cancel your ticket directly via your after-sales area before the originally scheduled departure in order to obtain a refund as quickly as possible.
If you were unable to cancel your ticket before departure, European law protects you: you will be eligible for a refund, but the process is longer and less straightforward.
For TER cancellations or delays, you will need to fill out an online form. Please select the form that applies to you based on the region indicated on your ticket. All forms are available via the following link (select the region of your TER on the map): https://www.sncf-voyageurs.com/fr/contactez-nous/reclamation-voyage/ter/