Sigh, I grow tired of pointing this out, but if they were able to figure out someone was doing this, and even who it was, then you weren't a l33t hacker. You used common tools and used a known exploit that people were watching.

You broke rules for personal enjoyment and weren't even good enough to not get caught. You didn't beat them, they beat you. It doesn't matter if you went unnoticed for several months, the fact is standard monitoring and logs were your down fall. Nobody ever thinks of the log files and network monitoring tools as being part of security. Not being prevented from accessing the system is not the same thing as successfully hacking a system unless you aren't caught either.