Some of these calls can be untraceable. Ever hear of Google calls?  VoIP calling?  There are lots of ways to hide. You'll never stop these calls, and blocking is but a temporary means. They get new numbers. The reason they continue to call people is because there are plenty of gullible people shelling out money for their scams. They have no idea who the phone numbers belong to, and being on the DNC registry makes no difference to scammers. The DNC is for legitimate telemarketers, but if you have credit cards with banks, car insurance, stuff like that, other telemarketers ARE within legal rights to call you regarding other credit cards, promo's, lowering interest rates, as well as other insurances. Also, survey takers are permitted to make calls as well. If you don't care to answer any call, then don't. Or answer and hang up. It is not illegal to dial a phone number and make a call. And what about people who simply dial wrong numbers? People DO still do that, you know! Although it would be considerate for them to leave a message just to say they've realized they've mis-dialed or reached a wrong number. Lastly, you COULD answer the call and asked to placed onto THEIR do not call lists. Sometimes they will do that. It's worth a shot. Yes, these calls are annoying but you don't have to buy or hand over money. And you don't have to answer. Sounds like you're just mad that some unknown caller dialed your number.