Air India — Its been over 7 months No Refund issued for my cancelled ticket

TcktNo[protected]
I paid INR27, 944 on 25thAug, rescheduled the same tckt on 22ndSep and paid INR25, 591. Cancelled it on 2nd OCT. GOT REFUNDED ONLY INR15, 469. While rescheduling CustomerCare agent said that " IN CASE OF ANY CANCELLATION I WILL BE REFUNDED WITH INR[protected]K+5%GST)".

I have not got my INR25, 000 yet!

I have made over hundreds of customer care calls, multiple tweets, raised multiple cases with them, every agent gives me a new case number, latest CASE NO. 14426766.
For every call to customer care I have wait for min 45mins. Wasted hours and hours of my valuable time in waiting line, still my issue is pending. Every time I call they say my issue will be solved on "PRIORITY". I just wonder if Priority case takes this long. how long a normal case would take? OR are they even taking my case on priority?