I've got locked out of my instagram. Out of the blue after years & years, their algo detected "suspicious" activity. Not sure what, but they sent a recovery ema

I've got locked out of my instagram. Out of the blue after years & years, their algo detected "suspicious" activity. Not sure what, but they sent a recovery email, which I couldn't get to because I used some old gmail account to register long ago and lost access to that gmail account. And there is no way to recover without it, even though they have my telephone number, a facebook account is linked to it. And so, after a while I gave up and created a new instagram (and lost a bunch of followers), but the old one is still there, I have no way of taking it down.