[quote name='BobbyVamDam']Holy Crap are you serious,it shows the amount i have on the voucher oh its probably on there computer right?[/QUOTE]
If it shows the amount still, you may be able to spend it. Your best bet is to just go in and show it to them.
They may be a dick about it, though, citing that they "don't keep credit in their system", or something. Even though I think they do.