Sounds like an opportunity for a system that plays one round of Lenny (or similar) then comes clean, admitting that it's a recording and we hope the telemarketer sees the funny side of it, "now please put this number on your do not call list for this and all other companies that you make calls for"... Then maybe a little pep talk that encourages the telemarketer to tell their boss to "stick this poxy job" because life will be better when they move on..