Reliance Jio Infocomm — Jio Fiber Wifi disconnected but didn't receive amount yet."No Objection in change of bank details" permission given already

Got Jio Fiber Wifi and cable connection disconnected 3-4 months back but didn't receive refund amount yet.Had mailed and called Jio Customer care thousands of times but they say that the issue had been escalated everytime.Had given them my permission to change my bank details from their end and initiate the refund to new bank account in my name as I am unable to update my new bank details, the link provided by Jio Customer care says "Refund Not Applicable".No action has been taken by the higher authority and they are not refunding my money.Please help and return my money back (Rs.2500).

Thanks and Regards