This isn't TS Entertainment's first time having their account terminated for some reason, and the label is busy at work trying to fix the mistake. However, while they're trying to fix the channel, they're going to create a temporary channel.
The label said:
Hello, this is TS Entertainment.
This is about the error that occurs when trying to access the TS official YouTube.
Currently, you cannot access it because of a temporary error. The official channel will be re-opened next week. Before it is re-opened, we will be opening a temporary channel so you can still see the recent MVs without problems. (After our official channel is restored, the temporary channel will be deleted).
We apologize for the difficulty accessing our official YouTube channel because of the temporary problem. We will restore as quickly as possible so you will have no more problem accessing it.
As always, please continue to show us your interest and love.
Hopefully, they'll sort this out soon!
Update: It appears the channel is back up on YouTube.
[Thanks to everyone who sent this in!]