Complaint regarding issues with Nokia 5 mobile

I purchased NOKIA5 Mobile but after some time i am facing many problems. Problems below given such as:
-All apps close itself
-sensor not working & automatically screen light on any time
-Fm not working
-Too much heat

I already many times complained in flipkart and nokia care but i am totally dissatisfied from both services. My nokia5 two times checked and updated by nokia care but i am facing same issues and nokia center said me we can’t replace your nokia 5 mobile because your mobile purchased by online. Flipkart already my replacement 3 time rejected. Flipkart technician totally un experienced and un knowledgable.
I don’t know why flipkart sale defective product and always said that our back end team also work on your complain.

JAI SHANKAR RAI
ROHINI SEC-31, New Delhi 110042
Email: jxxxxxxxxxxu@live.com