Who called from 2816019875

Switchboard operator, no caller ID, to voice mail, "hello? hello?......" click. Fast busy when I try to call it back.

to voice mail, "hello? hello?......"

i answered the call and said 'hello' twice, then they hung up.

Some person called, didn't speak English very well. My number is on the do not call list. When I called it back to find out who they are it was a busy signal

called today, I answer Hello?. Nothing but silence with swichboard sounds in background. "look, you f#%&ing called me, so say something!"
Then she speaks! "What?!, that's no way to..."  and then she hangs up. lol