Been there. Nagged the city of Seattle for nearly two years about fixing their insecure digital wallets, and in return they just acted weird to me and never really fixed the problem. Wouldn't tell me anything not even the vendor so I could communicate to them that this issue could exist elsewhere. The goal of these tactics is to delay long enough that you give up on publishing. So publish. Just be ethical and stay within the bounds of the law on what you access and release.
I did a quick test and seems like the full admin access that I used to get is slightly fixed/changed. I'm wondering if there was an issue and I have enough data to show there were full compromised of all users data, but it is changed now (might still be vulnerable but let's say it's not). should I still release something? they should have notified their users of such an issue right?