I have an atlassian account that as well as my own organisation (which I want to keep) is also set as the administrator of another organisation. I'd like to leave that other organisation, but apparently you can't do that yourself, and the only way (assuming you're not in contact with the organisation's other admins) is to contact Atlassian support, but I can't do that apparently because I'm only on a Free plan. So what on earth am I supposed to do!?