Hello one of my admins of my gameserver created for me an account under his email with the ip of my server.Now he doesn't belong in our team and he is resseting the top scores of my server every day.
What can we do about this situation?He is going to harm my server's rank.The ip is 89.44.246.180

I would recommend claiming the server yourself so he no longer has access to it since he is no longer an admin.

As i told you with my previous post he has no access to my server but he has made an account in game tracker and use my ip of my server.So i claim to you because it is about gametracker not my server.
I tried to make my own account with my ip but i get an error that the ip is already in used.

I would recommend changing your admin password if he still has access to it on the server. Then you can claim the server yourself and he won't have access to reclaim it.