I'm 17 and this is my first ever job it's at burger king been there for 2 months. I get a text from one of my coworker (who I didn't give my number to dont even know how he got it) calling me bitches and saying fuck you and probably other things in his head. How should I handle this if I don't get fired for him complaining to the manager. I even think he called me just 10 minutes ago because I got private call which I never get. Lastly yes I did call off but I called off about 2 hours before my shift. Which I thought I honestly thought would be enough time to find a new replacement.

Edit: First time ever calling off
Edit 2: Haven't worked this guy in literally a month since I started working.

Text he sent me: http://imgur.com/a/BgMfZ