Save his emails, texts, voicemails.. all of them. I don't know the exact content of all them or if they are considered threatening but it does sound like text book harassment. Reply back with this only: "These messages stop now. All are being saved as proof for when I go to file a restraining order which happens if you contact me again." Do that in writing of some sort so he can't say he never has warning. If you threaten it, follow through with it.
End of story. I have zero tolerance for a father acting so disgusting. There are no excuses.
So, so you think you can tell Heaven from Hell,
blue skies from pain.
Can you tell a green field from a cold steel rail?
A smile from a veil?
Do you think you can tell?
And did they get you to trade your heroes for ghosts?
Hot ashes for trees?
Hot air for a cool breeze?
Cold comfort for change?
And did you exchange a walk on part in the war for a lead role in a cage?