Samsung — Defective item and company is not taking it seriously

Purchased phone (F62) on[protected], while using phone for 2min i am able to feel the heat coming from the phone, i had called Samsung customer care number and they told my to go to services center, so, i visited the services center and the guy there telling me that every thing is normal, then i went to my home and after a day the phone start fluctuating many times and after that the screen is fully off but the phone is on, i had called the customer care and tell them all they are just making assure that they will help but they are not, the phone is not even used a single day properly, and it should be RETURN or REPLACE
by the company. I think that the company will do the same. THANKYOU