EaseMyTrip.com — Not refunding flight tickets cost against cancelled flight

I had booked flight tickets through easemytrip for travel date of 20th June, 2020 vide e-tickets as given below:
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The flight was cancelled by the operator "Air India" on account of Nationwide lockdown due to covid-19 pandamic. I was compelled to apply for refund. Till today, i.e. 5 February, 2021, I am continuously chasing them by mail but they keep telling me stories every time I request them to refund.