Amazon — I didn't get refund

Website:

Amazon.in

I had ordered Lenovo k8 note battery from Amazon and my order Id is[protected] the expected delivery date was over and till that time the product didn't dispatched and than I had also mailed to them they told to give my contact number and I had given also and than they are saying that number is not working it's working also [protected] and they gave me the tracking details of India post ED[protected]IN and in their website it's not giving any information so I decided to cancel my product and it's been a week I didn't got my refund yet. Kindly do the needful as the Amazon is much trusted company.