One thing I found interesting with Citi and Chase.... it started when Citi came out with their double cash card which is (at least it used to be) one of the best for general purchases that aren't in a high reward category on some other card. They approved me but gave me a pretty low limit for our typical spending. I called and requested an increase but I was told I needed to have the card for at least three months before an increase. I then asked them to cancel a seperate Citi card I had with a much higher limit and after a few minutes they came back and increased the double card to match the other, even though I left it open.
With Chase, I had a similar experience (2 card with essentially the same limit). I really wanted to cancel the 2nd card because of yearly fees, and they not only added that credit to my main Chase card, they added another 50% and I still cancled the one with the high fee.