2nd train missed in Nice because my first train was late

(FR)

Bonjour à tous, 

J’ai pris hier mon train de Ventimiglia (Italie) à Nice (France). Or, le train avait une vingtaine de minutes de retard, ce qui m’a fait rater mon train de Nice pour Paris. Un train INOUI qui m’avait couté 22€ avec la taxe. J’ai donc repris via Interrail un train qui m’a lui aussi coûté 22€. 

Je souhaite me faire rembourser de mon premier train Nice-Paris. Or, quand je suis allée au guichet de la gare, on m’a dit que je devais demander mon remboursement en ligne, sans autre précision. Où puis-je me faire rembourser ? 

Je vous remercie ! 

(ENG)

Hello everyone, 

Yesterday I took my train from Ventimiglia (Italy) to Nice (France). The train was about twenty minutes late, which meant I missed my train from Nice to Paris. An INOUI train that had cost me €22 including tax. So I took another train via Interrail, which also cost me €22. 

I want a refund for my first Nice-Paris train. However, when I went to the station ticket office, I was told that I had to request my refund online, with no further details. Where can I get my money back? 

Thank you very much!