If it's a cell phone, here's what you do-assign it the name of beginning with Z so it's at the bottom of your list with 'no ring' for the tone. Landline, try searching for 'call blocker' on the internet
that damn number is a scam. they want to know if you are home or not etc. Tried to call back and the auto message says number is not in service even if it just called 30 seconds ago WTF. Would love to bag these guys