My Imessage and Icloud accound are different.

I am unable to facetime or Imessage anyone. When I go into settings and try to toggle on Imessage or facetime it says "Imessage activation error, turn on to try again," after I turn both of them on it turns them off. I have tried signing out of my account and signing back in again but that doesn't work either. I am signed in with my Apple ID on my phone, and under my Apple ID it says reachable at... and my phone number is listed. I have no idea how to fix this.