This is an Identity Theft phishing scam - they tell you it is for an Credit Card Offer, once they get your Credit Card number they charge thousands of dollars on it. They did NOT "GET YOUR NUMBER FROM SOMEWHERE". It uses a sequential number Auto-dialing computer (Calls EVERY phone number by adding 1 to the previous phone number) and is run by criminals.... they could care less about the Do-Not-Call list. The phone number seen on Caller ID is "spoofed", which means it is not the number from which the call was placed - they just pick some random number to use when the computer dials the calls. In all probability, the calls are coming from Russia, Nigeria or another one of the countries that are known for email scams - IT IS THE SAME PEOPLE that send out Email phishing scams! The worst thing you can do is answer, that validates your phone number as a "real" phone number. It is then added to a list that they originator uses REPEATEDLY to call you... and then it is put on a list that is sold to other scammers (criminals, really) at a premium price, because it is then on a list of valid cell phone numbers!