Repeated calls and hang ups

I answered the phone after 3 rings. No voice or sound on the other end. then go tdisconnected.

Repeated calls that hang up when you answer. Calling back gets busy signal or no answer.

Receiving daily calls from this number. When I respond that my husband isn't home and ask to take a message, the caller hangs up. Today, I received 2 calls in quick succession and was hung up on both times.  I called the number back and the person who answered the phone was helpful.  He said he would remove our number from the automated dialer call list. If you do this, be sure they record your correct number as the number displaying on his end was not ours.

Called me at work... wanted to know if I was interested in a "Highly profitable trading system".

Yeah, Riiiiiight. Was probably some type of scam. When I said "not interested" he hung up on me.