I take it you have their regular credit card. I started out with them with only a $150 CL several years back. Never asked for an increase. Almost a year later, they gave me a CLI making my CL $500.
Then I got a big surprise several months after that. I received a letter in the mail saying they were upgrading me to a WM Discover card. I can't remember what the CL was but I do know it was several 1000. At the beginning of the year I called and asked for a CLI and I was told on the phone that I would now have a $7500 CL. But, when I got the letter in the mail it was denied but was given a $6000 CL. I called them upset by what I was told on the phone and the increased it to $6500. I asked for another CLI several months back and was denied. I think I have had the card going on 3 years now.
I like calling instead of using the LUV botton. I think you get more.