We recommend that customers call to cancel their space before no-show to avoid any issues. It is possible that your ticket(s) were not converted to eVouchers, in which case the value would remain in the PNR for future use (like an eVoucher). I would be happy to research and accelerate the resolution process if you send me a PM with your member number and PNR details.
As for the second comment, eVouchers and ticket numbers are actually not the same thing... although they share a similar number format, they are indeed distinct objects in our system and are accessed and applied in different ways.