The number leads back to something called predicto.com. I called both predicto and heycosmo and told them they contacted an secure internal government mobile phone and they were kind of scared when i threatened legal action.
If you go to www.heycosmo.com and look near the bottom right hand corner of their main web page, you will see a link to "block/unblock calls". Click the link - when you get to the page where you are directed to enter the phone number you want to block or unblock, enter the number 302-336-7405 (the source of all these annoying unsolicited calls we are receiving). The next page shows a box that indicates they are calling "your number right now...". You will see that the number is ringing, answered and then disconnected. Do that a few times to give them an idea what it's like to get their calls.