Phone just goes black while using..Vibration and ringing in background without display.OFFER SALE PHONE.DOES OFFER SALE PHONES LACK SOMETHING THAN GENUINE PHONE?Anyone having the same issues?

Humble request and need your attention to the matter. Users samsung M51Is it possible to provide a notification light system on around camera punch hole where already a light ringwhich appears while unlocking the phone .Will be revolutionary and ®️...