Amazon India — charge dispute amazon

Dear sir

I purchased a product on amazon and using my canara bank debit card same was not received and i asked then for refund. As per their confirmation refund was initiated on 5th of this month maximum time frame was 5 days.in 12 amount reflect in my account still it was not reflected in my account. They had provided the refund reference number as 75503728278023406154325, 75503728278023406797032, 75503728278023407016259 i had contacted your customer service number but no not rechable and 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.