Myntra.com — product cancelled but not refunded

I had ordered a shoe on 20 aug 2019 and canceled on 21 aug 2019 but till now i have not received any refund to my pay later. I called customer care but they are not able to solve my query, they are always saying to wait for 24 hrs and we will get back to you, but it's been 21 days my money has not been refunded. Still i have been calling them but they just say it will get resolve.