PNB — Refund is not credited by PNB

I've orderd a item from amazon and returned it worth Rs 2399. Rs 20 I paid from Amazon Pay balance. They have initiated the refund with refrence number 5134041275033232559683. Rs 20 for Amazon Pay and Rs 2379 for PNB account. I've received Rs 20 in amazon pay balance but not in bank account.
Kindly, unhold the amount Rs 2379 asap.