Do you assume your customers are stupid? If you do, please stop.  The only marketers that bet on stupidity are spammers.

Let me share an example.  Around 11 a.m. my cell phone rings and the caller ID shows an 1-800 number. I don't answer. Seconds later there's a voicemail message. It is a recording of a robotic woman warning of some account suspension. I delete the message without listening to all of it. About five or ten minutes later, another call from another 1-800 number. Again, I don't answer. And again, there's the exact same voicemail message. This has happened for the past three days. That's six calls from six different 1-800 numbers and six identical robotic voicemail messages.

Perhaps the spammer "strategy"  is this:
<ul>
 	<li>Use an 1-800 number since it looks official</li>
 	<li>Use different 1-800 numbers for each call, so target won't figure out it's the same entity calling</li>
 	<li>Scare the target with an official sounding message about "immediate account suspension" to create fear/anxiety. This fear will lead to target answering the phone five minutes after the original message and/or calling back.</li>
 	<li>Call at the same time every day because this will make a target answer or pick up</li>
</ul>
&nbsp;