Xiaomi India — no battery backup and heating issue

Sir,
I buyed redme note 5 pro since 10 july 2018. I have facing some problems on first day. Battery backup is not good and heating problem also. I submitted my phn 4 times in service centre but my problem is not solve yet. They have changed battery, sub board, system update. Everything has changed else motherboard. Now tell me where should i go for resolving my problem. It's a humble request plz solve my problem otherwise replace it. This time i m very disappointed to your product. So plz tell me what should i do for battery backup and heating problem.