The Journey was DODWORTH to Barnsley at 06.52 checked the same ticket no issues. Then Barnsley to Leeds 07.06 checked ticket and he wasn’t having it. Northern Rail is the company and I’ve had these tickets from November and decided to start using them as I don’t do this commute that often now with working at home. Got the tickets and binned the letters thinking I would use them
OK - so Northern Trains. Probably others with knowledge will post soon explaining what is likely to happen next.
My guess is official letter from Northern asking for your side of the story and maybe then also a letter telling you a sum you can pay to prevent that going to court or whatever. In court they would have to show the ticket you had WAS fraudulently filled in - they might not be too keen on that. When you get letters about this post them here (take out your personal details) so people can advice on best options etc, and indeed what to say to them in response.
Hopefully you gave them accurate name and address so that you will get these letters (as if not and you do not respond to them when they come it is far more likely this will get escalated to court without you knowing it and then more hassle to sort it out.
Make copies of the other vouchers you have now, but I would use the remaining vouchers clearly filled in with a decent working biro (in fact when you have filled them in take photo as a copy as that might show how the one they confiscated looked like the others you have or will have filled in and used. At the end of the day/journey of using the others, keep them on leaving the station as useful evidence ref all this (ie do not hand them in at the barrier when the trip completed for example)
Hope this helps for now, feel free to post any more questions.
Good luck with this.