The answer is "Report it to the Titans, and include a clear indication that this is ongoing harassment."
I can promise you that, provided I have the time, I will personally look into any such claims. I'm not even limited by the 30-day message timeout. After the Alexandros Stavrou case of a few years ago, we are well aware of the subtleties, frustrations, and dangers of long-term harassment in small ways.
If you don't trust the Titans, then I'm afraid there's not much I can do for you.
If you don't trust me, then I'm afraid there's not much I can do for you.
I do not promise to automatically convict someone merely based on an accusation of harassment and a claim that "this is hard to investigate and understand, so you will just have to trust me and punish him."
I do promise to give such claims the attention they deserve, and attempt to work out a suitable remedy, even if it's not one of the normal Titan punishments.
