I monitor them. As I've mentioned before, I used to supervise on a survey call floor, so I give them a monitor report.
I go through their whole thing, answering their questions, whether they're trying to sell me something, or do a survey, but give them a rough time. I'm a tough respondent! When they stop I go on as if I'm their supervisor:
"I monitored your last call. You did pretty well - very polite. I noticed you got a bit frustrated at times, watch your professionalism when she gets at you. 8 out of 10 for that. You read all the questions verbatim, 10 out of 10. Product knowledge was good, but you stumbled a bit here and there. Don't say "um", you really have to get over that. I counted 4 times, so I can only give you 6 of 10 there. Your voice quality is good, but you were a little close to your mouthpiece. Move it back a bit - I could hear you breathing. Overall, 24 out of 30. Not too bad, but lots of room for improvement. Now, final notes: you have a very strong accent, and at times it appeared the respondent had trouble understanding you. Speak slower, and try and get that accent under control. Any questions? No? Okay, you can go back to work." A lot of telemarketing now is done from India, and they're really hard to understand. By the time I'm finished with the poor fool he's so confused he thanks me and I hang up.
That's if I have time and feel like being a jerk. Otherwise I tell them to put me on their do not call list. There's another one around now that's a recording about various businesses. I haven't figured out how to stop that one. They've called here a few times.
Hawk