iMessage incorrectly flagged as spam - keeps going in and out

I have been fighting with apple support now since JUNE regarding my iMessage being falsly accused of being spam. I was never given a warning OR notification - just one day it stopped working. When I contacted apple support they said it was because my cell phone number was marked as spam.

Here is the thing though - it goes in and out. So it will not work because of "spam" and then work for a day or so. And then it will not work and say it is blocked because of spam and then 1 MINUTE LATER, work again. During this time period I am not sending ANY spam texts at all. I have photos to show that I will get a warning and then 1 minute later it works. Now I am locked out again and absolutely no one at apple will help. The last time I contacted apple support they said there was nothing they could do since it was already reviewed. And yet, since then, it has activated and deactivated 4x!!

I NEED MY IMESSAGE WORKING AGAIN. Has anyone had this experience where it keeps going in and out? And how do I get to the top level of customer service? This is crazy!!