Hello @sudhir
Thank you for your request.
The Swiss Half Fare Card Online ticket can normaly not be refunded. But I recommend you to contact our Online-Support: ticketshop@sbb.ch / +41 848 44 66 88 (0.08/min), perhaps they can do something for you.
If you have bought your Swiss Half Fare card at a SBB train station, please go directly to the counter for asking a refund.
If the card was purchased through another company, please contact them directly.
Kind regards,
MarinaZ