I worked in one of these call centers just after high-school. Not even a molecule of ethics existed in the entire company. My job involved getting yelled at by people who were sick of getting calls from dozens of different companies, and occasionally talking with someone gullible enough to come in for a sales meeting, who would then yell at everyone involved once they discovered they had been duped.

I can't remember exactly, but I think I eventually got fired because I started to deviate from the script. Sometimes being honest with people, and sometimes trolling angry people. It was a horrible job.