Samsung — S21FE Heating issue from day 1

I have bought my s21fe on jan 2023 . from the day one I am having the heating issue with your s21fe . I even have given to the service centre to solve my heating issue . And you all have been dening that its a normal heating . How can a new mobile have so much of heating problem that i cannot even put my mobile to my ear after 5 to 10 min talking.
I have requested you to refund the money but you all have denied even that . I again asking you to refund the money .