You’ve got a few legal options, but yeah, you’ll need to be persistent.
First, you can take it to the Consumer Grievance Redressal Forum or even the District Consumer Commission. If the service was denied without a valid reason, that could be seen as a deficiency, and you might be able to claim compensation.
If your personal info was mishandled, that’s serious too. It could be a violation under the Information Technology Rules, 2011. You can definitely file a complaint for that.
Also, if your complaint on the grievance portal was ignored or deleted, report it directly to the Ministry of Consumer Affairs. Share all your proof. It might not have been a simple glitch, and raising it can help make things more transparent.
Lastly, if there’s been a delay or your privacy’s been breached, you can ask for compensation for that too. Use whatever evidence you’ve got. Recordings, chats, photos, it all helps make your case stronger.