What can i do if i got banned because my account was hacked?

I am. As I mentioned, it says it is an unofficial ban. Let me explain. There are basically two types of PBBans streaming - full and lite. When cheat violation is raised on a lite streaming server, you will show up on the unofficial master ban index, contrary to official master ban index (where people banned on servers with full streaming go).

Now, you might wonder how that changes anything. The thing is, enforcing an unofficial master ban is an opt in process - server admins have to physically check a box agreeing to enforce bans that appear on the unofficial master ban index (UMBI). For that reason, appealing to the server admin that runs the server you were banned from to not support the UMBI becomes an extra option, aside from two options possible both for official and unofficial master bans - the appeal (which failed) and getting a new copy of the game.

I hope that clears it up. Still, this solution is far from perfect, as it still is a cross game ban... basically, you might get unbanned from this server, but other servers accepting the UMBI list will still deny access (although you should be able to play on servers that only accept the official bans). Getting a new account will be the only way to get a clean start everywhere.