These methods are effective because they weed out people who know the scam is not real. Those people who return a voicemail or robocall have self-selected as particularly vulnerable to the scam. Fraudsters then do not have to waste time on the phone, trying to convince a target that they are real. They can get straight to the extortion.
The IRS will never make initial contact with you over the phone – only through certified mail. If you do receive one of these voicemails, there are two steps you can take to report the fraud:

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