I told I don't have an answer - not " I didn't want to repay it everything went wrong".
People need to have faith in you, first and foremost. Your answer should always be, yes I will cover any losses incurred with my escrow service. Any answer other than that and you shouldn't be running an escrow service, and that's the reason you got the reaction you've gotten.
Now I know it was my mistake , the thing that *I still didn't know* is : who did all this epic trolling.
It doesn't matter whose mistake it was, what matters is that it was your responsibility. Your first duty is to your customers, not finding out who made you look bad. Yeah you got trolled, but it's your (in)actions people have a problem with. The issue wasn't with the mistake, it was the way you handled it after the fact.
As for who, who knows. I'm not going to reveal specifics about pms I've seen in reports here, but I will say it's not wise to taunt scammers when you leave them negative feedback. It's disrespectful, and a good way to make enemies.