Air India — Refunds

Address:

AT-VISHNICHAK CHANDPUR POST-SAMELI VIA-A G BAZAR DIST-KATIHAR

I had booked economy class from Delhi to Patna on 2nd March 2022 by Air India whose travel date was 5th April 2022 but I had to cancel the journey due to my reasons. So I canceled my travel ticket on 3rd March 2022.
As per Air India's ticket cancellation rules, there is a full refund on the canceled ticket within 24 hours and I was also assured that there will be a full refund.
Till now I have not got the refund, today when I asked on the helpline, it is being told that your ticket is non-refundable. While I had asked on their helpline before canceling the ticket, it was told that within 24 hours, there is a full refund on the canceled ticket.
regards, sumit kumar