I call people all the time, and if they don't pick up, I don't leave a message. I will just call back later. I'm not a scammer and I'm not out to get your money. Just sayin'. But go ahead and block every number that ever calls you and doesn't leave a message.
I googled the number and it appears to be some kind of garage door company in East Haven. Maybe. Maybe not.
A call from "John Connor" of the fictitious National Police Troopers Association. He immediately started asking me for money and refused to explain the company. I can think of better ways to fund Skynet.