How to "haggle" for more college money?

[Tinijocaro]

I've been hearing lately, inreal life and on this board about people calling and trying to get the college to cough up up more money than was originally offered. Some people are successful.
Who do you call, how often do you call, what do you say? Any info greatly appreciated!

How do you do this, who do you call, how often dodo you call.