Who called from 234566780

Same number calls and doesn't leave a message. Doesn't look like a real number.

This number keeps calling and saying I am a bad American, asking if I know all the words to the American National Anthem.

This number has repeatedly called and asked for me by name, but never indicates why they are calling. The most recent time they said they were calling from "The United States of America" but would not provide additional information.  I am on the do not call list and continuously threaten to report them, but it doesn't even seem like a complete phone number because it's a digit short.

They have called 3 times so far. First time I answered I said hello three times, no answer, then heard an automated thank you and the call terminated.

I got more than 10 calls on this number over the last two days.