Realme C55 Keeps Restarting on Its Own—Won’t Turn On Properly

I have been using my Realme C55 for just one month, and now it has completely stopped working. The phone shuts down by itself, starts vibrating, briefly displays the startup screen, and then turns off again, repeating this cycle endlessly.

I tried holding the power and volume down buttons to force a restart, but the problem persists. Despite following all the troubleshooting steps, the phone refuses to function properly.

For a brand-new device, this is completely unacceptable! Realme must provide a solution immediately, whether through a software fix, repair, or replacement. I expect a prompt response and a resolution—I should not be dealing with such a major issue on a new phone!