Apple India — Mobile phone flickering issue after change of display and need of new mobile as replacement or refund

16-3-22 iPhone 13 pro max purchased at chroma store, select city walk, Saket Delhi . 27 -5-22 flickering issue of display. taken to b2 x service centre in ansal plaza which is authorised service centre by Apple. Display changed Without consent. Device hanging while using Mobile . Resubmitted device but no issue detected . Now facing flickering issue . Going to submit the device again.