Rude, demanding employees working for or on behalf of United Healthcare.  Relentless - robocalls repeatedly, and if you pick up, the demanding employee gets on the line insisting you provide them with personal information.

The number which shows up on Caller ID, 952-388-0832, is useless - when you call it, it confirms it's owned by United Healthcare, but offers no option to talk to anyone.  I tried the "next door" numbers of 952-388-0831 & -0833, and was able to actually speak to someone at United Healthcare.  These people said they would submit my number to their Do Not Call list.