They never leave a message
Does anyone know who they are?

called & all they left on the answer machine was heavy breathing, then hung up

We are a business, and are getting calls from this number claiming to represent a medical facility for billing, but the facility has no idea who they are and does not use outside billing services.
They reference the facility name, but never their company name.

They are a New England Based medical billing company. I work for a health insurance company and we get calls from their outsource company in India all the time. For some reason today their auto dialer keeps calling our number and hanging up. The website for their company is http://www.athenahealth.com/

These are outsourced calls coming from Dell Perot Systems.  Their main number is 972-577-0000.
http://www.perotsystems.com/
The actual caller may be from asia/pacific call center.

Thank you.
Enjoy!