Got a call and was hung up on when I answered. Will not ring when I call back.

Have gotten several phone calls from this number numerous time during the same day everyday. No one speaks. I call back and it says the number could not be completed as dialed.

I keep getting a regular phone call 2 -3 times a day....very annoying.I do not answer.  I do not know who it is that is calling.  I do not care who it is so much that I wish it would STOP!