Just received this call during a work presentation and had to scramble to silence my phone (did not expect calls). Didn't answer and no voicemail. Showed Minnesota number but I received a couple of similar calls from NJ. Glad to have sites like this one out there keeping people informed.
YES - worry. I did talk to someone. They couldn't give me a straight answer. Changed with each statement. Told remove me from call list, they hung up on me.