Air India — Refund of cancelled flight ticket

Sir/Madam,
I have booked Air India flight from Guwahati-Kolkata-Bhubaneswar (Booking Reference:YH8DP, date 17 Oct 2021). However, there was re-schedule of the said flight from Guwahati to Kolkata which led to cancellation of the ticket as it was not possible for me to catch that rescheduled one. Based on Air India support service the cancellation was done (The feedback reference number: WB-DGAU[protected] for Case ID[protected].
However the refund amount is still not done after repeated assurance from Air India Customer Service.