Struggling with Instagram App Login for a Month

I've been unable to log into any of my accounts via the iPhone app for the past month, which has been nothing short of a frustrating ordeal. I can only access my accounts through the web version. I've probably lodged complaints and submitted requests 10-20 times, but it appears that my efforts have gone completely unnoticed. I've gone through every troubleshooting procedure in the book. I deleted and reinstalled the app and even purchased a new iPhone, but I still had the same problem. It's perplexing that I'm still dealing with this issue, despite my best efforts to solve it. I'm at a loss for words in this situation and desperately need a solution. Please, if anyone out there has dealt with a similar problem or knows how to resolve it, your assistance would be greatly appreciated. It's past time to address this issue.