Xiaomi India — mi a2 model. purchasing only three weeks through amazon. now its dead condition

Sir i purchased a2 model mobile only three weeks back. Four days back mobile condition dead. So taken to amazon so they told to mi service centre. They asking four days time to find out the problems. But am very upset because my mobile very new mobile please kindly inform me what you going to do. This is my mobile number [protected]. Ian expect your call thank you.