Xiaomi Company Mobile Brand - my mobile got dead due to miui update

hi sir, as i bought a flagship mobile xiaomi(mi **t) before a year, the was too good and the performance is too good. BUT AFTER THE SOFTWARE UPDATE I PUT MY MOBILE IN CHARGE AND CAME BACK IT NEVER GOT BOOT, the next day i gave my mobile in service center they said that your mobile dose'nt have any liqude damage or any physical and internal damage but i dont know why your mobile is booting and they were asking about rs:*****(mother board and display) to repair my mobile.I DONT KNOW WHY I WANT TO SPEND MONEY FOR THE COMPANY'S FAULT,MY MOBILE GOT DEAD DUE TO THE BUG IN YOUR UPDATE AND NOW NOW I NEED TO PAY FOR IT AH? ITS NOT A RS:**K OR **K MOBILE ITS COST IS RS:**k AND THEY WHERE ASKING ANOTHER **K TO REPAIR IT CAUSE OF YOUR FAULT

HOW CAN WE CUSTOMERS TRUST REDMI AGAIN

SIR,PLEASE KINDLY READ INTO MY LETTER AND TRY TO FIX MY MOBILE IN FREE OF COST
PRODUCT DETAILS
MODEL:MI**T(*GBRAM)
INVOIVE DATE:**:**:****
EXPIRY DATE:**:**:****
IMEI NUMBER:***************
I WISH YOU WOULD GIVE A POSITIVE RESPONSE