This [1] is a fantastic idea! (link via spin the cat [2]) If telemarketers can robocall [3] us, we can certainly use a computer to keep them busy on the phone.
Oh, I would love to set this up.
[1] http://www.metafilter.com/152614/Hello-this-is-Lenny
[2] http://spinthecat.blogspot.com/2015/09/hello-this-is-lenny.html