Are Writs Maintainable Against Private Banks?

Writs are maintainable against (i) the State (Government); (ii) an authority; (iii) a statutory body; (iv) an instrumentality or agency of the State; (v) a company which is financed and owned by the State; (vi) a private body run substantially on State funding; (vii) a private body discharging public duty or positive obligation of public nature. If the particular Private Bank is doing anything unlawful, which it shouldn't have as a Public Duty, then the Writ is maintainable. Otherwise, a private dispute with a Private Bank will not hold sufficient locus standing to make the writ maintainable before the court.