I managed a large call centre for a well known telephone company, but we dealt with incoming business callers, thats quite fun if you know your stuff. The staff were highly trained and although taught to up sell and always be closing there were no targets to earn your wage it was set regulated pay. \the staff were just slightly lower paid that a first line manager.
Then they started new part of the centre cold calling, they were payed considerable less, given basic training and given a script to follow, they would all start the job full of get em enthusiasms and burn out very quickly and normaly before even their trial period ended so the company would recruit more. Now thats the worst kind of call centre and I was happy that end didnt have anything to do with me although I was offered a promotion to run it, the lady that did take it on couldnt reach her targets and was sideways moved to a project which is the step before you leave as thats the end of your career.
Also the poor saps in the out going call centre where persuaded not to join the union, bad bad move.