These are annoying telemarketers. Best way to handle them is, if your phone has a call blocking feature, use it. I do and it has reduced the number of annoying calls by about 90%
got a call from 856-229-0988 just minutes after I had left someone a message, so I quickly picked up, total silence on the other end, not even a recording or noises, and I had only answered without looking at my cell phone screen. keep getting these kinds of calls from different parts of the country, and I usually let them go to message, urrgh, now someone knows there is a live voice on my cell. sorry I was so quick to answer.
seems to be no way to stop these. I definitely would never speak to anyone or even respond by pressing "one" as some other people have tried to do. just another nuisance call.