I have a personal Instagram account, and another for my band. The band account recently disappeared -- I can't log in, I can't recover the password (it just says "no users found"), links to the page and tags bring up an error page.
According to the help guides, if the account had been "disabled" I should get prompts telling me that with instructions to appeal when I try to login. That isn't happening.
Since the account seems to have totally disappeared, I even tried to re-register with the old account handle, but the account creation page tells me the username isn't available (so there's clearly still some records associated with the account).
I can't find any way to contact support for redress but would really like to re-enable the account in order to maintain consistent handles for the band across various social media.