If the Last Pax who is WL after charting is not traveling you have to take Non Traveled Certificate form TTE. You need to file TDR to get Refund.
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Obtain certificate from the TTE /Conductor in case of PARTIALLY waitlisted e-ticket, LESS NO. OF PASSENGERS traveled, This original certificate must be sent to GGM (IT), IRCTC Ltd., Internet Ticketing Centre, IRCA Building, State Entry Road, New Delhi-110055 after filing on-line refund request for claiming refund.