Air India — I'm complaining regarding refund of my air ticket

I booked a flight from air India website, departing from Delhi to Torronto on 3rd May 2021. It was postponed due to corona. So i cancelled the flight as it was refundable. i cancelled it on 24 May 2021, i called customer care to cancel it. They then initiated the refund process and then i mailed my details and request for refund at [protected]@airindia.in on the same day. i was given assurance that i would receive my refund within 21 working days. It now has been more than two months yet i haven't receive my refund nor any email from air india on when i will be getting my refund.
The refund amount is Rs.1, 28, 209.
my e-ticket no. is[protected].
my flight no. is AI 187