Canara Bank — Regarding the refund amount from Amazon

I returned the product which I bought from Amazon worth ₹1160/- and they refunded my amount at 19-20 August 2023. But the amount is not reflecting in my bank account yet. Amazon provide me the return reference number i.e.
[protected]. I give to my Bank's customer care executive but they said there is no transaction details with that reference number. Amazon said they issued my refund. I want to get my refund soon. Please co-operate with me. I will highly obliged to you.