So I called the 877-295-2080 number and the rep couldn't find my account, I told her that I opened it up today and I was calling to see if I could have a higher limit.
She then transferred me to an "account specialist" who was able to find my account and I guess the other agent told the specialist why I was calling because she just confirmed my information and asked me what I'd like my credit limit to be, didn't ask any reasons or anything. She did ask for my income and I told her what it was with my wife's income and she asked for my income separately as well.
I asked for a limit of $3,500 and she took a minute and said "Congratulations, but not really, I can't offer you the $3,500 you asked for but you've been approved for a limit of $1,500"
So, I accepted it and that was that.
I hope this helps somehow, I'd try calling that number and asking for the account specialist.