How do I remove non-existent organization from my profile?

I literally have an organization I never joined that no longer exists on my page, but the profile picture (which is hideous) is prominently displayed on my page. How do I fix this? 

My page: https://github.com/LA

Bull**bleep** organization: https://github.com/lawrencemuters

I have contacted support about this and amazingly they have not been able to help in the slightest.