invoice value is taken as Rs.3,06,75,000/- instead of Rs.30,67,500/-. It is the petitioners stand that the value on which MEPL had paid duty was Rs.14,84,959/-, thus, the differential duty demandable was Rs.15,82,541/- whereas the department has demanded duty of Rs.2,91,90,041/-. In our opinion, the petitioners are attempting to bring to our notice factual errors in the impugned order. For us to accept the petitioners’ contention that they supplied goods having duty liability of Rs.45,29,528/-, essentially entails a fact finding exercise. There is nothing on record to indicate that the duty liability of Rs.45,29,528/- claimed by the petitioners is accepted by the respondents. The petitioners proceed on the footing that the petitioners supplied goods having duty liability as claimed by them and therefore, penalty is excessive. To arrive at the conclusion that the petitioners supplied goods having the duty liability as contended by them obviously necessitates a fact finding exercise.