Amazon India — refund of product which I purchased through amazon by canara bank upi

Dear sir
My account number is[protected]
IFSC code - CNRB0005684

I purchased a product on amazon on 30th August 2019 using my canara bank amazon UPI and i cancelled on another day on 31 August 2019 but the refund i was not received yet.
and i asked then for refund. As per their confirmation refund was initiated on maximum time frame was 5 days. Still it was not reflected in my account. They had provided the refund reference number[protected].

I had contacted your customer service number they is no proper response hence i mail you. Please check and confirm the status if your response was worst in mail too i'm going to file in banking ombudsman.