What legal recourse do I have if my visa application was wrongfully rejected?

Visa decisions for foreign countries are generally governed by that country's own immigration laws and processes, which are largely outside Indian courts' jurisdiction — your options for challenging the decision would typically need to go through that specific country's own appeal or reconsideration process, if one is available, or reapplying with corrected or additional supporting information.

If your concern instead relates to an Indian visa or OCI application being wrongfully rejected, you would have avenues to seek reconsideration through the relevant Indian consulate or the Ministry concerned, and in appropriate cases, potentially challenge a clearly arbitrary or unlawful rejection through a writ petition before an Indian High Court.

Since the specific process depends heavily on exactly which country's visa or which category of Indian immigration document is involved, it would help to clarify this specific detail and consult either an immigration consultant familiar with that destination country's process, or an Indian immigration lawyer if it relates to an Indian visa/OCI matter specifically.