raising credit limit

[Farril De foor]

I called my C/C companies to get my credit limit raised and I hear oh that is reviewed every so often we cant do that.
Well I have great credit and 1 card has not been raised in 2 years.
What can I say to get them to raise it?

I did call 1 of my cards and they raised it up by 3 K in just minutes. How can I get them to raise it?
Thanks