Air India — Refund incomplete, promised full refund while cancellation , but gave only 4K instead of 16K

Hi
I got a refund of only 4038 Rs instead of 24372 Rs which was committed to me by your customer care guy .

My PNR is HMYBP (Now in Cancelled Ticket status)
My refund Reference number is WB DDEL[protected]

When I booked my Tickets from Delhi to Surat in Nov on Nov 6 the terms and conditions said that you can cancel free of charge 4 days before travel.

Customer Care Initially gave me Credit of 24 372 Rs for Open ticket and asked me to take refund from [protected]@airinida.in from where they only gave 4038 Rs .Even after mutliple follow ups they keep promising the amount but dont deliver.

But now they charging 3000 cancellation charge is not ok I need my remaining amount of ticket as i cancelled many days before travelling and was confirmed and committed by your customercare