You apparently do not know this but never, never, never call an unknown number back that you do not know and they did not leave a message. 99.9% of the time they are fraudulent callers looking to hopefully take you to the cleaners through your wallet via your bank or if they are unsuccessful in reaching you they hope you call back and push that optional "remove my number" button where you just authorized them to sell your phone number to any other scammer out there. What you need to do is suppress the desire to call the number back as it is obvious they really have no business with you any way and you block that number from having any further access to your phone. You may also report them to the FCCC online if you don't want to block them and they continue to call. My life is great as I take great pleasure in blocking every single number that rings my number and isn't on my contact list. I never answer calls from unknown numbers and I immediately block them. Problem solved and they are stopped from accomplishing their dirty deed.
Sent them to voicemail, they didn't leave a message. From Selbyville, DE. And it looks like several other people on here received a call about the same time, 8 in the last hour.