Lenovo K8 Note Complaints & Reviews

I have bought a lenovo k8 note mobile from flipkart on 27/03/2019 vide invoice dated 24/03/2019

I am facing basic problems as below mentioned after day to day use my problems increased

1. Can't send messages on last call received,

2. Call attend problem during one call to another,

3. Gps not enable in ola,

4. Unable to copy data from usb, unable to call recording,...

I had purchased lenovo k8 note on june 29 2018 now my mobile getting switch off problem after the oreo update and its continuesly not getting use rhe mobile for 5 minutes it will get switched off. I had went to lenovo centre but my phone problem is not get solved till now and my mobile warrenty is upto next 6 months. So kindly take necessary steps to resolve the problem...