Just add this to the reject list on your phone. Don't pick it up and if you do, just hang up on this number - don't engage them in talking - they don't care about taking you off their list and by answering the call, you've confirmed that your phone number is "live" and will continue to get calls.
I wish the phone companies would crack down on these scams but they stand to profit from all the calls - especially calls to cell phones since they're billing you for the minutes your phone rang - even if you don't pick up. Say "bye" to your precious minutes.
And don't give me that "they provide jobs" argument - being in the mafia, robbing or killing people, scamming others etc also provide good paying jobs but they are illegal and unethical. Lots of people have honest paying jobs - why can't these tele-marketers? Stop annoying families who don't want to buy into your scams.