Here is an example of how complicated these scams have become. It's not just phone or email scams, but even texting scams.
A few weeks ago, I received a text, informing be that "Franklin" is looking forward to seeing me for my appointment. I read the text, and wondered who Franklin was, and what is this appointment for. But I didn't respond to the text. Then a few days ago, I received another text reminding me of my appointment with "Franklin." Each of the texts asked me to respond. I didn't respond.
Then today, I received a phone call from a number I didn't recognize. Moments later, there was a voicemail. I listened to the voicemail, and it was another reminder for this appointment that I never made. The voicemail directed me to call a certain phone number to confirm my appointment. But the most curious thing was the voicemail never said who was calling. It never said who my appointment is with. There is a blank space in the robo-voicemail for the doctor's office name. But there was no name given. That was when I realized the scam. The purpose of the scam apparently is to obtain a response. My so-called appointment is in a couple days. It'll be interesting to see what happens next.