Main chat broken for 4+ days after pasting a large message, no response from support

On Oct 8 I pasted a ~6 MB text (my ChatGPT history export) into my main chat as a single message. Since then the main chat will not load on iPhone, Mac, or web, and the iPhone app crashes on launch.

What I have tried: in-app bug report on Oct 8 (no response), the web ticket form on Oct 12 (no response), and a report filed through my assistant. Four days with no acknowledgment from anyone.

The data is intact server-side. Only that one oversized message needs to be removed from the backend. Can someone from the Muse team please delete the blocking message, or tell me how to get this escalated?