We have a regular phone in the office at work, with multiple lines, and a receiver for slamming a phone. I get the opportunity most days, while in the office, to slam the phone down on telemarketers or robo-calls.
I'm fair with my answering. Everyone gets two seconds. With telemarketers, I have the satisfaction of knowing they're wasting their time, and need to move on. With robo-calls, the lack of a request is the tell-tale that notifies me of a computer generated call.
With robo-calls, if you announce the name of the company again, someone will pick up the phone, or a recorded message will start, so I never say the company name but once.
I've startled people before that either were distracted, or intimidated when I answered. They use up their two seconds without responding, so I hang up. They usually call right back, but I've heard some wait awhile before calling again, in the hope someone else will answer.
When the secretary answers the phone, she has a unique way of dealing with telemarketers. When the ask for someone, she puts them on hold, and lets them wait for a long, long time. If they're still there, when she finally returns and replies: "They're not answering their page. Would you like to leave a message?" they usually respond with "No, I'll call back later." or hang up.
I worked as a telemarketer years ago, while between jobs. It was brutal, and hard to not let being jerked around by people to become personal. Maybe that's why I wasn't a good telemarketer. Those that were, had thick skins, ignored those that slammed the phone, and immediately dialed another number. I'm guessing they made a living doing what they do. With me, expecting a decent paycheck was futile. If I did get orders, most of them were people using bogus credit card numbers to have their fun with telemarketers.
So, I understand how it's tough job to be a telemarketer, but still know slamming the phone is the best way of just getting rid of them. If they're good, they'll just go on. If not, they'll need Xanax and blood pressure medication.