Air India — refund not processed for a cancelled flight for almost 22 days

Air india cancelled flight 591, which was supposed to start from chennai and land at bangalore on 11 nov 19. They announced the cancellation on 1 nov 19 via email and mentioned "cancelled due operational reasons kindly contact ai office" this in the email.

I called air india and they confirmed that refund would be done within 2 weeks from nov 1. I have placed multiple calls/emails and they keep saying it will be processed in 2 weeks - but it has been 22 days - and the refund is not available in my account.

I request help from this forum to help me get the refund.