I keep getting calls from this number - when I call it back it connects but no one is there

Keeps calling my daughter's phone harassing / called back and told them to take the number out, he got mad and told me to not call them and harass them. They don't like it when the shoe is on the other foot. Idiots.

Receive daily calls from this number.  I answer phone Hello - someone asks my phone number  I ask who is calling and they refuse to identify themselves.  I am on do not call list.  Am reporting the number.

Keeps calling me