Who called from 7402636073

Called.  disconnected when I said hello, hello, goodbye.  Does not ring on callback.  Been getting a bunch of so-called Duke Energy calls lately.

when you answer it hangs up

We screen numbers we don't recognize. They did not leave a message. CID says Mount Vernon OH.

I couldn't answer because I am in class but when I called back it didn't even ring.

Concerned scam or hacker, can someone hack your phone with a simple phone call to it? I tried calling it back on my cell and when it went through my home phone started ringing with this number on it. So creepy. Whomever it is, a feeling,I don't think a good person or group, acting criminal