Myntra.com — not received refund amount from myntra in my pnb bank account

I had ordered one fastrack watch of 1121 Rs from myntra website and made payment by debit card, but due to some reason I cancelled the same order. Now myntra people are saying that they have already refunded the amount, that is 1121 Rs to my PNB debit card by which I made the payment. But till now, I didn't received any amount in my account. Order was cancelled on 23 June 2019 and for refund to be reflected in account they said to wait till 3 July. But till now I didn't received my refund, they had sent one ARN and told to contact PNB customer care, but it is of no use...what I should do now, I am not getting my amount, 1121 Rs