i have purchased mi4i phone of Xiaomi company from amazon website. After 30 to 40 days phone was not working properly, so i have submitted to service centre. till today fault is not resolved and i have submitted my phone atleast 5 times to service centre. and total approx 6 months duration my phone was in service centre turn by turn. last time i have complain in this forum and the complain number was 208. so please help me as soon as possible. if u need any document plz tell me. i have all jobsheets which was given by Xiaomi company service centre.