Amazon India — I didn't get my refund amount in my bank account

My name is Himanshee I ordered in Amazon with account -details are :
Name shivam gupta
e-mail- [protected]@gmail.com
No-[protected]
I placed 2 orders :
Order no. 1- placed on (19jan2021) JBL earphones black colour (amount-599/-) and returned on (23jan2021)
Order no.[protected]
Reference no.
30005110191019174388114

Order no. 2
Order placed on generic multi purpose laptop table with dock stand (amount -399/-) (17march2021) . On Amazon account shown that the product will be delivered by 23-march 2021. But on 20march2021 on Amazon account shows that the product is delivered, I complained on the same day that I didn't receive and order then they told me that during handling your package is misplaced by mistake, so they told me due to their fault they will refund my amount directly to my payment account . But till now I didn't get my refund I have compliant multiple times for both the products . Amazon costumer service are telling that we have initiated your amount to PNB bank and asked me to contact PNB costumer service .l tried to get help and contacted pnb costumer service by telling that Amazon have provided me reference code for refund but didn't get any help.
Order no.of order 2
[protected]
Reference no.
30005110761076199895218

I have tried so many ways to get my refund amount back but didn't get any help . I request you to please address my request.
Billing address:
B-254 keshav kunj apartment plot no. 15A sector -22 Dwarka new delhi-110077
Account no- [protected]
Account holder name - Himanshee