I too have received numerous calls, and usually hang up or don't answer when I see this number. However, I wish I was not on their calling list. It's definitely annoying!
Calls come in everyday. No idea who it is. I don't usually answer the phone when it is a strange number. Answered this time and got that dead air while someone realizes that hey, the phone's been answered, quick say something!
Before that all I heard was the same hum of dozens of people talking. Dead giveaway they want something.
The caller called me on a Sunday, I did not answer because I screen my phone calls. When I returned the phone call, I simply got A recording stating that if I wish to be put on the Do Not Call list press the number 6. Nothing to identify them!! When I googled the number, it came up as Augusta,Maine.