Lenovo — Lenovo k4 note mobile screen

Address:

Sitapur, Uttar Pradesh, 261001

I m using lenovo k4 note from last 5 months but in previouus month the mobile screen automatacilly half black. i m going lucknow service center but the service center person neglact it n doing worst behaviour... i m saying thats the company fault but the person in service center behave very crudely n very bad manners... i request 2 all that plz not puchase the lenovo mobiles...because facility is very bad...