5 calls so far today. When I answer they hang up. No message is left when I don't answer and when I call back it won't even ring through.

This is an Insurance Company. I recieve about 10 calls per day and have even asked for them to remove my number from their list. They dont remove it and instead hang up.

Have you tried blocking them?  This might not be a legit company calling, they could be spoofing the name of an insurance company.  There have been reports of a scam caller who's CID shows up as AllState Motor Club, for example.

Selling health care insurance - unsolicited.

They called from Clearwater FL, they just sat there, never said a word....but.... I received a call about 30 mins earlier from VA.... these harassing insurance companies that I never asked to call....