Lenovo Smartphones — heating and other issue during warranty period after one time complaint

Address:

Lakhimpur Kheri, Uttar Pradesh, 262701

My smartphone lenovo vive k4 is in warranty period, there is heating and some other problems, i complent to service center in my city lakhimpur kheri, they spent approx 3 week to resolve it but the main issue is they can't return me my phone in proper working condition. Heating issue is same to same and also battery not charging created
So plz take action toward company.