Do like I do,
Yes Mr $#@^@^ is home, All I need from you is a Valid Credit Card to put you through to him, the cost is $85 for the first 5 minutes and $2 per minute or portion thereof after 5 minutes. That usually makes them Hang Up.
When I had the landline, some times I would say, ‘Hold on a minute ... ‘
Put the phone down and walk away. Eventually, I would hear the ‘phone off the hook’ tone and hang up the receiver.
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Other times, as soon as they started their sales spiel, I would interrupt with “not interesting, thank you, bye” and hang up before they could continue.
I'm doing that.