Lied about student loan refinance bonus

Tldr; I refinanced my student loan in December 2024 in expectation of a $599 bonus, but now I am told I did not qualify. However, the application page said I qualified for that bonus, and I also confirmed with an agent in live chat before I submitted my application. (I have screenshot of the chat and the application as evidence) How do I hold Sofi accountable because this is straight up lying and false advertising?

More details: I randomly saw a promotion for refinancing student loan on my account page. I recalled I had received a similar bonus roughly two years ago, so that's why I also wanted to double check with a live agent. Live agent confirmed that I qualified, so I went ahead and applied.

Fast forward to recent weeks, I never received the bonus and submitted an escalation request. Then I was basically told that the information provided by the previous agent was not correct and my bonus request was declined.

Is this even legal? What should I do?