WOW1 Trial account attached to main account

I seem to have attached a trial account to my main account in the battle.net account management and can't see a way to remove it.

I mistakenly clicked on the button in the list as it was next to my main account and it added the trial account without any warning or confirmation...

I wouldn't really care but it now pops up asking which account I want to connect to now when I log in.

Can this be removed without having to call account services as being in Australia the timezone difference is a pain.

Cheers.