Yes, I just tried, and the phone number just goes to a menu system with no way to talk to a human. If you choose abuse, it tells you to report it online. If you choose support it tells you that if you're an enterprise customer you can create a ticket. If you choose the "under attack" option, then do send you to a human who tries to sell you cloudflare service and doesn't understand that cloudflare could possibly be attacking you (and refuses to transfer you).

I tried emailing the abuse address, but I get an automated reply saying to report it using the online form (which won't let you report anything not hosted on a cloudflare website).

I also emailed their noc address and haven't had an automated reply yet, so perhaps that will actually reach a human.

As far as I could tell, the handler wasn't inside the NOC, but was able to contact them directly. I suppose 1st and 2nd level don't actually have to be inside the NOC to be of use.

Wouldn't be surprised it they do some sort of CLIP filtering/routing, or if they no longer use humans on the front lines, it's the way of the enterprise once they exist long enough :-(