'7. So far as the view taken by the High Court that the remedy by way of recourse to arbitration clause was available to the appellants and therefore the writ petition filed by the appellants was liable to be dismissed is concerned, suffice it to observe that the rule of exclusion of writ jurisdiction by availability of an alternative remedy is a rule of discretion and not one of compulsion. In an appropriate case, in spite of availability of the alternative remedy, the High Court may still exercise its writ jurisdiction in at least three contingencies : (i) where the writ petition seeks enforcement of any of the fundamental rights; (ii) where there is failure of principles of natural justice; or (iii) where the orders or proceedings are wholly without jurisdiction or the vires of an Act is challenged. (See Whirlpool Corpn. v. Registrar, Trade Marks [Whirlpool Corpn. v. Registrar, Trade Marks, (1998) 8 SCC 1] .) The present case attracts applicability of the first two contingencies. Moreover, as noted, the appellants' dealership, which is their bread and butter, came to be terminated for an irrelevant and non-existent cause. In such circumstances, we feel that the appellants should have been allowed relief by the High Court itself instead of driving them to the need of initiating arbitration proceedings.'