Hello so today I was leaving the station and they asked for my rail card. I had no clue that on my train like app it was under 16-17 saver and has been for a while. I travel back and forth from uni so I’ve spent around 400-500 on tickets which should have been 1000. Will I be fined for all the tickets or just the one today. And how much will it be worst case cause it was a genuine mistake I had no clue