Refund taxi fare caused be system malfunctioning

Yesterday (Sunday 04/06/2023) there was a system failure in several trains around 20:00, which forced me, after one hour of waiting, to take a taxi to return home (67€). I've tried to ask for the refund of the fare on the customer-service website but I haven't found a procedure for this kind of cases. The most similar case has been “Refund for delay ” but there it doesn't let me specify the problem nor the amount to be refunded.

Any support will be welcome.