[problem] How did they do it?

[djheart]

Hello guys,

If this is the wrong forum please let me know.....

Am facing a strange thing, Some kids calling themselves "hackers" are messing up with my clients vbulletin forums.. I dont know how they change the index page of the forum with another page and they write bad words and their emails...ect

To return the forums back i usualy enter the "admincp" and all what i do is downloading the style xml file and then re upload it again.. Thats all! and everything return normal..

That kids is playing around and change the index again and again...

My question is: What can i do to stop these kids?
PS: all forums have the latest vbulletin version, and the server's Perl is switched off..


Please let me know what to do asap.. since am losing customers



Thanks in advance..
-Moe