<human>: Give me the gist of the text in a nutshell

I have a credit card though Alliant Credit Union. I've had the card for a little over six years now, and my credit limit is still $500, the same as when I first got the card.

I've been trying to figure out how to get a credit limit increase without luck. For reference their website [says] to call the main number and talk to an agent.

Here's what I've done so far:

1. Called the number listed on a website, talked to an agent. She transferred me to an automated card services menu, which said to "call your financial institution for a credit limit increase."

2. Called the main number back and explained I wanted to get a CLI, and that I had been transferred to an automated card services menu which said to contact the bank. Agent claimed Alliant Credit Union doesn't offer/service credit cards, and that I must be mistaken (lol).

3. I tried calling Alliant again and asked about a CLI, this agent recognized that they do offer credit cards as a service, but insisted that they don't have limits higher than $500. Again, I'm pretty sure this is insane.

4. I tried calling back again, got in touch with another agent, who claimed there's no real way to increase my CLI, and that I just have to cancel my old card and reapply for a new one. I don't want to do this if possible because it will negatively impact my credit score. I'm also fairly certain they can offer a CLI since they say so on the damn website haha.

They have three branches, but two are limited to employees of United Airlines, which I'm not. The other is about four hours from where I live, and it would be pretty difficult to get there.
<bot>: My credit union (Alliant) doesn't seem to know how to process a CLI. Has anyone successfully gotten a CLI through Alliant, or have any suggestions on what I should be doing?