Calling back and pressing 5 will only ensure that you will get even more calls. 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 $45. http://800notes.com/nb/search?q=call+blockers
called my work number, wanted to know if i was anti abortion, informed this was a work phone for sales, don't have time for personal calls let alone calls such as this