Did not answer. I've been getting calls from numbers that will have different area codes (303 and 212) and different last 4 digits, but all start with the "121-" prefix. The following seem to be the same: 303-121-7149, 212-121-9949, 212-121-9949, and 302-121-5764. These could be coming from India. The only difference in their phone system is the country code of 71 instead of 1.
Caller ID displays "Name Unavailable" and it is a non-native speaker of English who informs you that you are eligible for some kind of insurance...yada yada yada.
Woman with spanish accent claimed to call for Medicare. Asked verify address, phone. Asked health problems in detail, and I answered. Finally asked my supplement to Medicare, and I went to get the card, then thought, wait, they should know that, so told her, no, I heard about scams, she hung up.