taxable services under the heading 'construction of residential complexes'. It is claimed that by insertion of clause (zzzh) to Section 65 (105) of the Finance Act, 1994 bringing construction of complex services under the service tax ambit by Finance Act, 2005, service tax was paid by the assessee, collected from the petitioners herein after issuance of Circular bearing No.108/2009-ST dated 29.01.2019 by the Central Board of Excise and Customs (Service Tax) clarifying that any services provided by the seller of the flats in connection with the construction of residential complex till the execution of sale deed would be in the nature of self-service and consequently would not attract service tax, the petitioners approached the builder and filed a common refund application dated 09.09.2009 through the builder before the respondent authorities seeking refund of service tax paid under the mistaken understanding of law. The same was rejected by the Adjudicating Authority pursuant to which, an appeal was preferred before the First Appellate Authority and being unsuccessful on appeal, the petitioners approached the Customs, Excise & Service Tax Appellate Tribunal, South Zonal Bench, Bengaluru. The said appeals having been dismissed, Central Excise Appeal No.09/2017 and connected