the orders of any State Commission; and (b) to call for the records and pass appropriate orders in any consumer dispute which is pending before or has been decided by any State Commission where it appears to the National Commission that such State Commission has exercised a jurisdiction not vested in it by law, or has failed to exercise a jurisdiction so vested, or has acted in the exercise of its jurisdiction illegally or with material irregularity.” 10. A bare perusal of Sections 21 (a) and 21 (b) would reveal that the powers thereunder are different and distinct and the powers under Section 21 (b) is very limited. The NCDRC itself, in the decision in Kongaraananthram v. Telecom Distt. Engineer, Ma- C.A. No.270 of 2012 Page 10 of 35Habubnagar2, held that its revisional powers under the said Section are very limited. The said Section provides power to call for the records from the State Commission and to set aside its order issued sans jurisdiction vested in it by law or if the State