This number rings 2 to 3 times then hangs up. This has been happening for about a week. ID says bill pay network.

How can I stop receiving calls fro this number?

You are the only one who can stop them - Do not answer unknown calls and do not call them back. Consider getting a call blocking device (or app for your cell phone)-they're available online and start around $50 or so. http://800notes.com/nb/search?q=call+blockers
Also take a look at: http://www.wikihow.com/Block-a-Call