Myntra.com — Refund not received and No help from Myntra Help Center

I had ordered Van Heusen Bag, its size was big so i had returned it, payment was done using UPI, they updated that my Refund has been Processed. UPI refund should be credited instantly. I have not received my refund even after 4 days. I raised ticket with Myntra helpdesk and they closed it. If i call on their Helpdesk number, it has no option to talk to any person so it also is useless. I have no way to contact Myntra and get my refund back.