Caller ID: Placement Department. It's a local number that called a main business line so I answered. Someone was on the other line but didn't say anything for a few seconds after I said the standard greeting, and then hung up on me. I'm seeing more spam/telemarketer calls coming from our own area code. Must be spoofed numbers.

said Placement Dept. I blocked number.

Knew it was SPAM, blocked the number after checking here. Thanks for the info

Called our unlisted business back line that we never use and didn't leave a message

Called. No message left.   Blocked.