I was able to break through the scam veneer on one of these calls. It was remarkably professional up until I outright called him out and told him how I knew it was a scam (the email "from Google" didn't have the right headers, he missed a bit of the terminology, didn't recognize a term, and the caller ID number was listed as being used for this scam).

I asked where he got my information, and he claimed he pulled it from Github and cross-referenced it with a large public dump.