Call and a hang up. If you're receiving unwanted calls to your cell phone from this number, most smart phones have an option to automatically reject the call and you'll never even know they called! On an Android, you first add the number to your contact list, then while viewing the contact in your contact list hit Menu and choose 'Add to reject list'. You'll never be bothered again :)
Same call as from 925-418-3666. National Small Business Owners Assoc. The guy on the other side got belligerent when I told him they had to reference the Do Not Call List.