I've worked in a call center now for long enough to know how things are done where I work, and from what I've heard from other call center workers who work for other companies, I have heard nothing to suggest that the call center at which I work is any different from any other company.
So here is my top five list of pointless things to insist on when you speak to a call center. The particular company I refer to is Sprint; but feel free to substitute the corporation of your choice.