Millennia Patient Services, they do billing for different health services. It's a legit phone number, but just like any other debt collector they will hang up if you don't answer quick enough so they can get to the next phone number. Just call them back and they will answer.

I received a call form this phone number and stated to my wife that we owe money to the health care provider. The Heart Care Center and i requested for a billing and as of yet I have not received it.  Please e mail the bill to my email address. lisaroyvonne@q.com. I gave the caller the email and she said she will email right away and it has been over half hour. thank you.

It goes to a Patient Bill Processing center (doctor office)

The company is Mcimetro Access Transmission Services Llc. Apparently, they run execrable activity throughout the US. Mcimetro is located in several different states. Google the company name and see the interesting status & legal history of Mcimetro. Here is a good link that explains some of the company's tactics - http://goo.gl/vkFoVU

Calls my business cell about every day at random times. Silence when I answer. Jailbroke my iPhone and installed iBlacklist. It now blocks and hangs up on them for me :-) Wish our govt was like Canada and aggressively pursued dead calls and robocalls.