When we had a land-line, and no Caller ID, I would wait until the caller started talking before I would pick up. My poor SIL had to start a ton of "messages" before I would answer. Now with just a cellphone, if the party isn't in my Contact List, I don't answer. ~
Andy, if I didn't have current business with that company, I would have just let it roll to voicemail. You can always check for messages.
^This^ I did do telemarketing for a while when we needed money for extras when building Home Two. At least I worked for a courteous agency owner who insisted we be polite and allow the person to end the call immediately if they so chose. My biggest time-eater was when I got a lonely old person who was so happy to have any human contact that they droned on and on. Again with the courteous boss, she said we should listen to those people, no matter how annoying, because it could very well be their only contact with a real person that day.
To this day I can remember her name, Charlotte, and can picture what she looks like from memory. A real quality person. [emoji813]
And about that miss-dialed call from the dentist? One time a dry cleaner left a message that someone's cleaning was ready. Not mine! I called the dry cleaner back to let them know they needed to figure out what the right phone number was.