OnePlus India — Oneplus Open after 1month display issue

Hey
I purchased oneplus open in[protected]
After few days in phone display black patche n line are coming. I m going oneplus care service center approx time 12.30pm they check my phone properly. No damage n good condition phone. tell me we call u after 5-6 hours. approx 5.30pm I received service center call he tell me your phone display is damage, next day I m going service center n check my phone. in my phone display 4spot on display outer side
I tell this is not my fault when I submit my phone condition is good not spot in display outer side. after my debate he accept mistake n tell me give 2-3 days
We sending your issu to higher authority
Now today 12 days complete no update

My service dock no : IN01025X[protected]

Phone IMEI NO : [protected]