Southern Railway — refund of booked ticket

I booked a travel ticket with pnr no; [protected] for travelling from tirunelveli (Ten) to villupuram (Vm) in train no: 12641 and my date of journey is 08.12.2017. At 12.36 pm, i received a message stating that train no; 12641 has been cancelled due to unavoidable circumstances. Based on this message, i booked another ticket pnr no; [protected] in train number 16128 and the date of journey is 09.12.2017 under tatkal quota. After booking this ticket, i came to know another message sent by your dept stating that train no: 12641of 08/12, which was stated as cancelled is now running as per schedule. So, i travelled as per the original schedule. But my second ticket which was booked in tatkal based on the message given by the dept cannot be cancelled since it was booked in tatkal quota. I request you to kindly look into the matter and make arrangement to refund the amount to me for the second ticket booked.