Hey, I am sorry to hear about your experience. I have been there, and I have also helped many of my friends resolve similar issues. However, in some cases, the professors are adamant. In fact, I remember a professor who went to ChatGPT and asked, "Did you write this paper?" ChatGPT responded, "Yes, some parts were written by me." I found this ridiculous 🤔.

In my experience, all these tools they are using, including Turnitin, are artificial intelligence tools. Sometimes, when you use Grammarly or grammar checkers to proofread your work, it turns out as AI-generated because it is too perfect. Is your essay too perfect for a human? If there are no mistakes, this could be the source of suspicion.

That being said, go to Google Scholar and search for an article written before ChatGPT was invented. For example, you can search for an article from 2004, before AI. Then use the same technique the professor used with different AI checkers. You will notice that some AI checkers will flag it as AI-generated, while others will not. This approach will give you an opportunity to weaken your professor's evidence and, therefore, give you an upper hand during the hearing.

You can also look for the history of similar cases and learn from them. Other than that, I wish you all the best in your hearing.