Sorry to differ with the views of the representative of Samarpan. In Government departments and PSUs, once an employee accepts promotion, he loses the right to revert back to his earlier post. All depends upon the discretion of the competent authority. So far as his right is concerned, he was free to exercise his right to decline promotion well before his selection for the higher post, but not after his selection and that too after acceptance of promotion.
In such situation, moving HC may prove costly for him moneywise as well as in earning the wrath of his superior authorities, besides failure in his legal venture.
If it is not his academic query, but a real problem, it would be better for him to request the competent authority on merits, but not merely on the plea of unsuitable working conditions. He can be benefited by administrative approach, but not by legal approach.
Apparently, he is not being made to work in different conditions than for others in the bank.