I worked in telemarketing for the longest 5 months of my life (Would you like to buy a Kirby vaccuum cleaner?) and can vouch for that you will really piss a telemarketer off by doing any one of those things I've heard them all. Seriously, the talking really slow is the worst thing you can do to a telemarketer - so... take note
I've heard them all. Seriously, the talking really slow is the worst thing you can do to a telemarketer - so... take note 
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