PNB — Refund initiated by Amazon but Not received

Address:

Godda, jharkhand

I have ordered the product Milton flask on[protected] date. Price of the product was 904. Order Number:[protected]. But have returned the product.
Amazon indicated the Refund on 15 January 2021.
Reference ID No.
30005103560357174608281.
But the bank named Punjab National Bank has still not credited my money.
This is urgent please help me as soon as possible.