Strangest Phone Call Ever

The other night, I received a call from An Unknown Number. I picked up, said Hello, and the caller hung up.

Today, when I said Hello, the caller asked for me by surname. Immediately, as per protocol, I asked the caller to identify themselves. After all, I'm just not talking to people I can't identify.

They hung up.

Kids, where the hell has our courtesy gone, that we neither identify ourselves to parties we're calling nor respond to invitations to do the same?