Apple India — Unethical behavior

Address: 201/205, 2nd Floor, Building No. 93, Ashok Bhawan, Nehru Pl Market Rd

I am an apple user and went to the f1 info solutions & services authorised service center, 201/205, 2nd floor, building no. 93, ashok bhawan, nehru pl market rd on 18th september 2020, around 1:30 pm i gave my iphone 7, which is in a warranty, in an issue of overheat. They took 3 hours to see it and first, they told that we will replace it and after i went over there, they told that it will heat it's normal in the apple is it so?? And they look a way long time to see it after that they told in an unethical manner and in a very rudely tone that it will heat they wouldn't change it, basically, their behavior doesn't sound good to me at all and they weren't replacing my iphone as it is burning up and i am not able to use the fingerprint scanner (Dfr) and instead of replacing it, they were saying it will heat as my phone was crossing 46°c and more than that. Is all the apple phones get heat up? And is it normal? And due to heat my phone is lagging and i am not to use the fingerprint sensor, and still, they weren't listing to me and doesn't replace it. I would request you to replace my iphone, as it has been very difficult to use or carry it, as it starting burning up.