Classification of man-made fibre as textile material enables retrospective excise duty recovery with payment period and interest. A new classification rule deems man-made fibres from plastic and plastic waste to be textile material under Chapter 54 or 55 with retrospective effect, validates excise duty actions taken during the retrospective period as valid, permits recovery of duties within a limited period with interest on delayed payment, and allows assessee to claim CENVAT credit for previously unavailed inputs, input services and capital goods; no act or omission is to be newly treated as a punishable offence by this amendment.