May 2009, the appellant discharged service tax of Rs.55,91,185/- through Challan No.50297 dated 05.10.2009. The payment was inadvertently not reflected in the relevant ST-3 return and no CENVAT credit on this challan was taken until February 2011. During departmental audit for FY 200809 to 2010-11, non-payment of service tax on import of services was pointed out. While making payment relating to subsequent years, the appellant inadvertently paid the very same FY 2008-09 liability once again through Challan No.10014 dated 02.02.2011. The said challan comprised service tax of Rs.1,31,70,733/-, of which Rs.55,91,185/represented the FY 2008-09 liability already paid in 2009, while Rs.75,79,548/- related to FY 2009-10. Interest of Rs.12,50,562/- relating to FY 2008-09 was paid through Challan No.10003 dated 14.02.2011. On discovery of the duplicate payment, the appellant filed a refund claim on 13.06.2011 for Rs.68,41,747/-, comprising Rs.55,91,185/being the service tax paid for the second time through Challan No.10014 dated 02.02.2011 and Rs.12,50,562/towards interest. The first adjudicating authority rejected the refund. The Commissioner (Appeals), by Order-in-Appeal No.548/2016 dated 01.09.2016, set aside the said order and allowed the refund. The Revenue filed Appeal No.C/40138/2017 against that order. Subsequently, the appellant's fresh refund proceedings culminated in Order-in-