This number has called me yesterday when I was at work. I didn't pick it up because I thought that it might be one of those debt collector type of thing.
Get free phone app MrNumber. Let's you block numbers, add a comment (if one wishes) and any number not recognized the app will show it as "suspected spam".
seems that when you register on job search engine "monster.com" this is when you get all these calls, I have received calls on all the numbers referenced here when I submitted a profile on Monster.com.. definitely scams