Random phone calls to the Help Desk

I just got off the phone calling another company's help desk to let them know that their newsletter platform platform might have been compromised for phishing purposes.

This is actually the first random phone call that I've made in my career but I did it Phish was one of the best and most convincing I have ever seen. The SPF, DKIM, and DMARC all passed. Unon further inspection I realized that it was another domain with a good reputation that had sent this email using their newsletter platform.

So yeah today I was that random guy calling a random help desk and letting them know their newsletter system might have been compromised.

I'm curious if anyone else has done this or been on the receiving end of one of these phone calls? I'm sure it happens but probably not that often. Most people probably just delete the message and move on.