The simplest method is to keep an old fashioned whistle ( the type with the pea inside ) and blow it very loudly down the phone. They really , really don't like that coming through their headphones.
I once had a call from a woman claiming to be from Microsoft. I asked her if she hadn't thought of taking up a more respectable occupation, such as prostitute. The call didn't last long!
Before he had a computer a friend of mine had a long conversation with a scammer about how he had no problems with his windows and didn't need new ones because he already had double glazing. I dare say the scammer was as confused as my friend.
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They really , really don't like that coming through their headphones.
Brian Cox starred in the radio adaptation of these"encounters". Anyone for a talking lion