Amazon India — I return the item but not but not get my refund back

Address:

House Number 14/3, Krishi Vgyan KendraKrshi Vgyan Kendra Road, 123029

I ordered the redmi note 8 pro and found it was defective and request they replace it but defect was same in the replaced item then i requested the refund they shows you have to self ship the item. Then as per guidelines i return the item (Order #[protected] through india post as it is defective and it has been more than 12 days that tracking shows item revive and still i do not get my money back.