You can sue them, but try seeing how much money you'll get....
They know it's illegal, but also know they can get away with it.
This happens every time a company goes under. Instead of blaming them, blame the prat who bought you a gift voucher instead of just giving you the cash!
I've always hated it when people bought me gift vouchers, never saw the point. Nothing's wrong with cash.
No wonder that grandfather walked out without paying for those games. Technically he wasn't stealing because he tried to offer a form of payment which was refused, that wasn't his fault!