I recently bought a non-refundable train ticket on Thello.fr from Paris to Venice. Unfortunately I made an error in the date, and noticed 10 minutes after the booking had been completed.
I know that most airline concede a 24-hour grace period over non refundable tickets, that allow for them being refunded. But calling the train's company customer service resulted in a negative answer.
Do you know if there is an European Regulation requesting a 24-hour or less grace period over online bookings, which could help me?