I found a severe bug in Binance

I'm a software engineer.
on 20th March I contacted Binance through bugcrowd, submitted a bug report for a bug I came across in Futures trading, gave them step by step guide on how to reproduce it and gave them my guess on what is going wrong and how to solve the issue.

on 21th March they got back to me and said that my claim is not correct and everything works fine, when I literally attached a screenshot and gave them proof.

Today Binance implemented exactly my solution without rewarding me through their bug bounty program.

I thought big companies are ethical and professional, but no, and Right now I feel sad that I bothered my self to report such severe bug that affects Binance income stream through Futures trading.

what do I do?

Update: I spent the past 10 hours with chat support, I’m pointing to something and asking them to check the logs and come back to me with an answer, and they kept talking about another thing, literally walking into circles. the bug severity is P3 and it is worth between $600 and $1500, the bug is being able to avoid liquidation when it gets triggered, so it’s not about taking money from the platform but rather not losing your money at the cost of the platform, now that it is fixed I think I’ll just let go.