This is almost my exact experience trying to run ads on Facebook. I created a Facebook ad campaign that was immediately suspended. The reason was I selected ads to be shown on Instagram, but the Facebook entity I was advertising from didn't have a Instagram account.

Okay, problem with their tool in my opinion. It shouldn't let you select running ads on Instagram if you don't have an Instagram account... But anyway I get the account unlocked via customer service and try to edit the ad to remove Instagram integration.

Account immediately locked again. Contact customer support again and they can't tell me why it's locked but they're able to unlock it for me.

This time I delete the old ad campaign and try to start a new one. Account immediately locked again. Third time I contact customer service and they won't tell me why the account was locked.

Since it's the third time, my account is permanently locked out and I'm no longer allowed to run ads on Facebook.

Afaik I did nothing wrong and didn't break any of their rules.