asked for office manager, then hung up

Called to talk to our owner, when he wasn't available asked for the office manager, and then said they would call back... Probably a charity seeking donations of money...

I received the call and missed it. On call back the phone rang a while and then was picked up and hung up. Then I called again and the phone was picked up and hung up. Then the third call a few hours later the number was no longer reachable and just clicks off.

Left a message saying they had an event to speak with me about.   Caller left a name; but not the name of organization.  From previous posts, I saw who it was and it saved me returning a call.