The Mistake is on you. You should have deleted or at least shown that you were no longer providing the service updating the thread and locking it. I see the thread is even self-moderated. Probably to delete posts of complainants?

But then again, it's up to you now... Look them up and settle the issue then convince them to get back here to get scam accusation reversed Otherwise it looks like the negative trust will stay if you don't do anything.