A K-line or G-line is a ban from a server or network respectively. They are unique to the server/network you're experiencing them on - like being banned from a channel, being banned from one doesn't ban you from them all. Being banned on one network doesn't ban you from all of them.
It can only be dealt with by the IRC Operators of the IRC network you're banned from, visit their website, find out the team or person who deals with K-lines, and find a contact email address.
Regards,
