Should I tell the owners?

This probably isn't the most important question for a lot of people, but I really want to know what to do. A couple weeks ago the minecraft server that I played on got backdoored and the owners had to shut it down for 2-3 weeks. Now it's back up and I got to the position I was at before it got shut down, but the person who backdoored it got back on and demanded money to not DDos it again, but no one could so he said that if he finds out anybody told the owners about it, he was going to take my account and take down the server again. So should I tell the owners over skype and hope they can do something, or should me and the people who know keep it a secret? I know banning probably won't work since he can most likely bypass it, so i don't know what to do. And if he does get my account, there's a way to get it back, right?

By the way sorry if I'm not making sense with the backdooring and DDosing stuff, I don't really know all the terms and picked those up from when it first happened.

Added (1). I'd rather not share his name… He's apparently a pretty known ddoser though. Has like 2k followers on twitter or something

Added (2). also, he has a squad of 4-5 people backing him up so even if he does get IP banned he has at least 4 other people to take his place…

DDoS means "Distributed Denial of Service", usually meaning making the server unplayable and denying its use to everyone. I would definitely would tell the owners or at least an administrator over Skype or something. Although the DDoSer is likely making an empty threat with stealing reporter's accounts, it would be best to tell the owners in some way that isn't publicly visible or in a way that can be traced to your account. Make sure to include any screenshots or other users at the time to help prove it. If you can mention the username of the DDoSer, that will help a lot.