No need to worry if you are innocent. Contact the server owners, we can't do much to help you here. Take a list of all the servers and search up their web sites (you can also press F9 in the server list to get extended server info).
http://hi-skill.us
Another note, servers don't usually blacklist by name, rather they blacklist by IP. So even if someone took your name they'd probably be reported for impersonation.
http://hi-skill.us
Another note, servers don't usually blacklist by name, rather they blacklist by IP. So even if someone took your name they'd probably be reported for impersonation.