Even I have an S21 FE, and when the green line appeared, I got the display replaced at the Samsung service center — they only charged for labor, and it cost me only ₹415. But your phone doesn't have any physical damage on the body.

Just visit the service center and check — if they accept it, great!

Even I have an S21 FE, and when the green line appeared, I got the display replaced at the Samsung service center — they only charged for labor, and it cost me only ₹415. But your phone doesn't have any physical damage on the body.