It's possible that the new owner is notified when an issue is submitted and is able to mark the issue as resolved, or IG notes that someone is using the account and assumes there is no longer a problem.
I don't know, but it sounds like the issue was resolved (correctly or incorrectly) the first time, so the user started filing a ton of issues, which were automatically marked as duplicate. Now he's spamming the white hat security form (https://twitter.com/dannyjhall/status/1310231761444581385), which is not likely to get him a response.
Ah yes sure you don’t pay Google a dime, so don’t you worry if you lose your account tomorrow, it’s not like anything is owed to you. Say bye to verroq@gmail.com
Then we would like an answer from FB about what occurred. The handwaving away about "nothing to see here" up and down this thread isn't a satisfactory resolution to the issue at hand. Someone alleges their IG was stolen and they allege that FB is batting away tickets about the issue. It would be nice to see FB respond to this. The urgency is compounded by the fact that Amazon had it's own little insider's ring of people providing "extra" services to people for a price.