Yes but you need to go to the box office Explain the situation and get a new ticket from them you will need to pay full price Then next time you are in you take your ST to the box office and they will refund less a £5 admin fee If you just buy a ticket at the turnstiles you cant get your money back -At least thats what I read somewhere anyway
You have to go to the box office and get a replacement ticket there. They keep your money in a little envelope and when you go back with your season ticket they'll give you the money back (less the "admin" fee of course). At least that's how it used to work. You obviously can't just buy a ticket on turnstile and then expect to get money back later!
Are you a London Tyke ? Are you sure you haven't sold it on the well established black market for matchday tickets at Oakwell ? I may call the police on you as a precaution.