Punjab National Bank [PNB] — amount refunded by amazon not reflecting in my account

Address:

603203

I am karan jakhar s/o ashok kumar. A/c no: [protected]. I purchased a laptop from amazon using my debit card on 20 jan 2019, but due to some reason i cancelled the order same day. The refund was initiated by amazon on 21 jan 2019 but i account isn't showing any credited amount.
Amazon provided me with a reference no. For the refund transaction: 75503729022026415756045.