19. On the other hand, we find force in the contention of the learned senior counsel, Sri Radhakrishnan, appearing for the appellants that the High Court has committed error in entertaining the writ petition under Article 226 of Constitution of India at the stage of show cause notices. Though there is no bar as such for entertaining the writ petitions at the stage of show cause notice, but it is settled by number of decisions of this Court, where writ petitions can be entertained at the show cause notice stage. Neither it is a case of lack of jurisdiction nor any violation of principles of natural justice is alleged so as to entertain the writ petition at the stage of notice. High Court ought not to have entertained the writ petition, more so, when against the final orders appeal lies to this Court. The judgment of this Court in the case of Union of India & Anr. v. Guwahati Carbon Ltd. (supra) relied on by the learned senior counsel for the appellants also supports their case. In the aforesaid judgment, arising out of Central Excise Act, 1944, this Court has held that excise law is a complete code in order to seek redress in excise matters and held that entertaining writ petition is not proper where alternative remedy under statute is available. When there is a serious dispute with regard to classification of service, the respondents ought to have responded to the show cause notices by placing material in support of their stand but at the same time, there is no reason to approach the High Court questioning the very show cause notices. Further, as held by the High Court, it cannot be said that even from the contents of show cause notices there are no factual disputes. Further, the judgment of this Court in the case of Malladi Drugs & Pharma Ltd. v. Union of India, relied on by the learned senior counsel for the appellants also supports their case where this Court has upheld the judgment of the High Court which refused to interfere at show cause notice stage.'