2.The petitioner has passed Diploma in Electronics and Communication Engineering and joined as helper in North Chennai Thermal Power Station on 01.05.1999. Subsequently, he was promoted as Technical Assistant in the year 2000 through internal selection. Thereafter, the petitioner acquired B.E.(EEE) degree from Anna University through part time in the year 2005 and thereafter got selected and appointed as A.E./Electrical/North Chennai Themal Power Station-1 through internal selection on 21.03.2007. While so, the 1st respondent has directed the petitioner to look after the works of Assistant Executive Engineer/Electical/MM/North Chennai Thermal Power Station with effect from 15.07.2013 as per regulation 49(3) of TNEB Service Regulation in addition to regular work till the regular incumbent assumes charge. The 1st respondent in his proceedings dated 26.12.2014 sanctioned allowance for additional charge allowances at the rate of 1/5th pay actually drawn per month and the petitioner was permitted receive this additional allowances for the period from 15.07.2013 F.N., to 30.11.2014 A.N., for 489 days excluding 12 days and E.L., for 3 days. While so, based on audit objection for the payment of additional renumeration for the in-charge post on the ground that there is no additional charge arrangement in the Central Office except Executive Engineer and above. Though the Chief Engineer in his U.Or.dated 01.12.2016 has also written to the Deputy Chief Internal Audit Officer that the additional renumeration for the in-charge post of Assistant Executive Engineer is permissible service and the said posts are independent as per the service regulation and requested to drop the audit objection. However, the same was not considered despite the request made by the petitioner on 24.08.2016.In the meantime, the petitioner was promoted as Assistant Executive Engineer and posted at Head Quarters on 02.03.2018. Now, the main grievance of the petitioner is that the 2nd respondent without considering the letter of the Chief Engineer dated 01.02.2016 and the petitioner's representation dated 24.08.2016, has issued a proceedings dated 15.07.2019 requesting the 3rd respondent to recover a sum of Rs.1,69,620/- as additional allowance paid to the petitioner on installment basis. Accordingly, the 3rd respondent by proceedings dated 25.07.2019 directed to