Amazon India — Not providing my refund back

I ordered a philips straightener at 08.04.2022. but i got a wrong product of nova straightener. i complained it and raised a request to refund back. then amazon parcel man came and picked uo my parcel at 21.04.2022. but in status it is not shown. and still they are not gave my money back of 2839. thet said we did not picked up your parcel. but they had at 21.04.2022. amazon not provide any receipt to any cusotomer of picked up delivery. please sir provide my refund back. i called them 10-12 times. raise my complaints. but my refund is not provided to me. please provide my refund back sir.