One of my friends wives works for an HMO that got hit. She said that within those first early hours, people were cold calling the clinics saying they were from CrowdStrike and wanted to help fix it. I don't know if it was successful but sure is dirty.
But yeah, screw scammers. In general, if it's time critical, make an outgoing call to a known number, never assume the call you're receiving is from the vendor they claim to represent. I almost got scammed while on vacation because of this, but I caught myself mid-call and fixed it.