Canara Bank — refund not yet received

Dear sir,
My account number[protected]
Customer id[protected]
I purchased a product on amazon on 15th october using my canara debit card and i received that product on 19th october but iam not satisfied with that order so i returned that product and i asked then for refund. As per the confirmation refund has been issued on 28th october. Still it was not reflected in my account. They had provided the refund reference number is[protected]. I had contact your customer service there is no proper response so i mail you. Please check the confirmation status.