Someone hacking my forum

Hi

I have a guy on my forum that is using some arcade script to change scores etc...

so i deleted the used...

then he registered again, so i banned his ip, then he turned up with a different ip...

he is posting his domain openly... his site says that they are a clan that do this kind of stuff.... the site is hosted on free webs servers....

Ohhh and he has been doing denial of service attacks, which he also said so on my forum..

can someone suggest what i can do?

 

 

 

 

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