Amazon India — received stone instead of mobile phone

Address:

Chennai, Tamil Nadu, 600117

My oder I'd[protected] have ordered Samsung galaxy M30s on 29th sep the next day on 30th I got a stone inside the vivo box. I got completely shocked and called customer care they said they will immediately look into and help. All of a sudden today I got a mail stating the order was delivered with intact condition. Further refund replacement is not possible. How dare this is completely unfair for reputed company like amazon. It is basic common sense how come vivo box can be sent and when wrote mail to customer care I have attached the pics. Please helpme in getting my product or refund. And please some help me in file this case legally.