There's no way to get it back, sorry about that.
You can try and send them tickets saying that you lost them, but honestly, there's a HIGH percentage that you will not get it back to its original state.
To remove your clan, it doesn't require sq or none of those personal information. To remove it, simply log in to Z8Games, go to "clans" up at the top, click "my clan", then simply just remove.
You need to log back out then in to see the results by the way.