Xiaomi India — product quality of redmi 6 pro

Purchased redmi pro 6 on july-4-2019 from official mi site. From day one i'm complaining about the product quality and even told that i've been given second handed mobile. I'm told product will be replaced but took too much time intentionally and no replacement done.
This mobile is have very much screen touch sense problem. It will sense thumb finger only and that also not much proper. Very much irritated with the mobile and xiaomi service.
Hereby i would like to escalate this issue to the higher end and i'll try my level best to tell everyone not to buy xiaomi mobiles.
Order number : [protected]