Xiaomi India — Mi service center guy (Marris road, aligarh)

Address:

Aligarh, Uttar Pradesh, 202002

I am a frustated mi user. i have a mi4i 16 gb which has many issues such as sudden call drop, lagging, hanging, crashing, over heating, ete. and my phone is still in warranty period, no help from the center.
the person sitting at the center is a foolish, uneducated, pathetic, who knows nothing but factory reset. He tells me that its the issue of my network (im using airtel, one of the best service provider). ive crosschecked my sim and it is working perfectly with other sets(redmi 1s).
he is such a rude, disgusting piece of bean bag, nothing else.
I kindly request you to please take serious actions against him, Its been 6 month im regularly visiting the center, but still no help from their side.
When i said that i will file a complaint against him, he was like, "okay, no problem".
Pleasse take serious actions against him, its a kind request, an i am helpless because its the only center available in my city.