Phone screen off

URGENT:

I called my phone via the website, then the screen went off and won’t go on again. But if I send my PIN with a code (example: 0000 LOCK) it does work, and then I enter my PIN to unlock it, and the screen go off again. The phone works, and recieves SMS, but can’t be turned ON or anything else…

Could you help please!

Factory reset the phone.