Thanks Pzzytat. These [***] called me at 8:15 AM. Obviously a boiler room. Non-native speaker who I could barely understand. After the perfunctory greeting, she/he (?) asked for my date of birth and my address. I thought "enough already" and told them I don't give out information to unknown callers.
Just a comment: I realize that because I have a "relationship" with them, they are exempt from the Do Not Call list, but any company (United Healthcare included) who uses mass telemarketing in this day and time is COMPLETELY brain dead. Maybe not scammers, just stupid. Get with the 21st Century!