If the ops in karaoke realm are refusing to respond to you (and I hope you kept copies of the e-mails/messages that you sent), then the next step is to enquire of the networks help channel (usually #help). Make sure you are polite and that you let them know that you have tried to clarify the matter with the ops in the channel.
Sometimes, although this is completely at the discretion of the help channel ops (who are usually IRCops), they will join the channel in question and try to get you a reason and a solution.
Alternatively, you could search
Search IRC and see if you can find other channels like that on other networks.