Thanks for sharing your awful account Phoebe. Much love from all here!
I agree that every time they reach out to contact you (for whatever reason - such as reporting), calmly ignore that question, and mildly ask "So how are we progressing regarding my abuse letter? I haven't heard from anyone. Feel free to contact me with an update. Have a nice day"
So that sends a powerful message that you are in control of any interaction. Not them.