I don't know how the situation for jobs in the US is but in Italy, where I had my experience, the people that do this job don't do it because it's their dream job but because they have bills to pay and finding "something better" is not always easy.
Job market isn't great here either (France, so not as bad as Italy), and I perfectly understand one taking a shitty job to support one's family.
Still, getting a job where you are paid with my money to harass me is not the way to get on my good side.
Either way, I never take those calls, and never take anonymous calls either, unless I'm looking for a job.
Beside, that kind of behavior from a company here (in France at least, and probably most of Europe) is probably illegal.
Yes, their job is shitty, but when your job is to bully people (by phone or otherwise), don't expect rainbows and unicorns.