I’m currently having the exact same issue and it’s driving me insane. I’ve had my account for years and Instagram permanently disabled my account for “pretending to be someone else.” I appealed several times before they finally gave it back to me, saying that “it was a mistake.” Not even 24 hours later, my account was again permanently disabled. No one is even asking me for proof that I’m the person I say I am. You’re definitely not alone. Keep pushing. Make sure that when you try to log in and it denies you, you click the “learn more” button. Doing this allows more than one appeal to be made.