Punjab National Bank [PNB] — refund issue of order cancellation on flipkart

I have ordered a book for Rs.335 on Flipkart on 20 march 2020 and made payment through PhonePe by debit card.
But due to sudden lockdown condition due to COVID-19 they cancelled the order and refunded the money on same payment method with reference number P2004020314081550103652 on 1 April, 2020.They said to reflect the refunded amount in 9 business days, but ther money is not credited to my account even after deadline date past i.e.(April 10, 2020).The bank customer care is not listening about the complainant on behalf of COVID-19.