I see exactly what happened. You filed a report. It was rejected for whatever reason by a mod.So, I came back to check my inbox because I have friends from the past ten years that I'm keeping in contact with and the suspicious message I originally complained about, the one that caused such a dismissive response from the moderator, is now missing from my inbox and the account is missing--yet, no moderator or owner has reached out to reconcile. Again, after ten years, I expected more. Guess the site is going downhill.
Another user submitted another report and another mod handled it and they treated it like a spam account. Spam accounts get wiped out which is why the user is banned and all posts and dm's deleted explaining why the msg is gone from your inbox.