The only way to deal with these bolix callers are NOT TO PICK UP . 99% of all calls which only list city or state are bloody telemarketers. We automatically block all of these via an app on our Mac. They do change numbers, but they are very easy to recognize. Additionally, the hours of 9am, 4:30pm, and 6 to 7 pm (EST) are always prime time for these bloody creeps. Do yourself a favour and do not pick up!