At first you need to represent to your department head in this matter. If the response is negative, then you will have to file a Writ petition.
Your HOD will consult their legal panel in considering your matter.
I don't think department heads will directly apply the ratio held in Supreme Court - as it has to be interpreted properly and moreover it has to be ascertained whether decision was overruled.
But, you can mention the ratio in your representation - so that the matter will be considered in right spirit by legal panel.