State Bank Of India [SBI] — Amazon initiated refund process but didn't receive yet..

Sir I have ordered an item on 4 November 2020 amounting to rs329 and I have made my payment through debit card..on the next day I cancelled my order and then my refund was to be credited on 2-4 business days..but sir it has been a week since I haven't received yet.. Amazon stated refund initiation on 6 November and till 12 November I haven't received it yet.. Amazon gave me a refund reference number which is 987439 and tell that contact bank about this and I have also contacted the bank to know the status of my reference number but they are not saying anything about this..so sir please help me as soon as possible..