Who called from 6156824015

Someone from this number keeps calling, and every time, I can hear someone is there, but the eventually just hang up.  They have been calling for over two weeks off and on.

Repeated calls. No response when I answer.

Continued calls, no one says anything, when i dont answer they dont leave message

Repeated unwanted calls

Phone calls was selling vacation packages with if you tour their resort.  I did not catch the company name