Apple India — heating problem of iphone 7 plus

Address: Khordha, Odisha, 751012

I have bought the iphone 7 plus on 25th of march 2018... And encountered heating problem of the phone while calling, simply using the phone, chatting etc... So i approched in apple authorised service centre n they fix it... But after a week again i m facing same issues... So is it worthing it’s price of 70000??? I am just wondering i will buy a phone worth of rs 70000 n have to visit it’s service centre within 6 months of buying and that to i need to go again n again??? Plz care for ur image n value apple