When in doubt: hang up, look up, and call back
This also applies to offline solicitation. Someone came to my door and asked me to sign on to switching my gas supplier. He said it is a supply chain change and will not affect anything beyond I getting a smaller monthly bill, still coming from PG&E. I told him that it sounds wonderful but this is the first I'm hearing of such a thing and I need to research online what it is about before signing anything. He said he has all the details in his paper folder and I can read it. I insisted on doing my own research. He said the deal is off once he leaves and it is my last chance. I told him, "so be it, such is life".Did a quick Google search the next day and figured the process is legit but people out there have gotten higher bills than before.Moral is to fight the human-interaction pressures and be adamant on doing your own research. No shame in that.