Charge sheet issued on presumption

I have been issued a charge sheet on non implimentation of order which I have not received. I have submitted my written repply and appeared before the disciplinary authority. On inquiry it is concluded that the prosecution has failed to prove that I am guilty. For this I have submitted RTI reply which I obtained from the authority. Finally i was exonerated fully from all the charges. Now, the vigilance approached to the reviewing authority and I received a memo from reviewing authority that my exoneration was not correct and without studying the case fully. A new allegation raised against me that I have deliberately misplaced the files for escaping from the lapses. The RTI repply which I had submitted as proof of my innocence is not acceptable since the missing file contains all the details of the correspondence. Actually I was not in the section during opening , maintaining and reporting of the file. It is their presumption only, no evidence is there. In this circumstances, how to reply for this allegation sir