See who's calling

This person called me, I didn't answer because I didn't know this number. He left a voice mail telling to me to stop calling him, Otherwise he will prosecute me. I never called this number. I always call to persons that I know, And I only call or answer if I know the purpose behind the call, Example call or answer about something to deliver etc. But I'm not expecting nothing, And nobody promise to call me. He seemed a bit nervous. Seemed to me a young male voice. Be careful.