Air India Express — Refund of my cancel ticket amount

Address:

Chennai

Dear sir /madam,
Good day,
I booked a ticket from Trichy to Singapore by airindia express and due to covid situation I cancelled my trip to Singapore and I cancelled my air india express ticket on 10 september. at the time of cancellation the customer executive said that the amount will be back to the account within 10 working days.but already completed 70 days. and still not received anything.when ever calling to the customer care they just saying 2 days of maximum 5 days the amount will be back to your account.but more than 2 months passed like that and nothing received in account till now.so I request you kindly take some necessary action on it.
Thanking you
Jitendra Kumar
[protected]
I am attaching the flight details.