“First they said for me to go to a site and download “teamviewer.dmg”
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Are you kidding me?
NEVER EVER download software at someone’s behest, specially if it’s someone you don’t know and trust. I grumble and yell when multi-m/billion dollar software companies tell me they want to remote in to our company’s computers so they can do fixes. Yeah it sounds easier, and I usually relent, but at least it’s someone I know, and usually I wipe the software after they are done.
Even worse, NEVER EVER download software that you don’t recognize or that isn’t published by a recognizable software company.
No offense, but knowing the last 4 digits of your CC is not something that proves access to a real transaction. It only demonstrates that it’s likely your card. It doesn’t build their credibility, it only shows they know what card you have.
As I wrote, they had more than that, they knew my full name, full home address, home and cell phone numbers, full amount of that transaction, what the transaction was for and the date and said they were the company that assisted me with the software I bought then. They had enough information to convince me they were legitimate.