I keep getting calls from this number and when I pick up they never answer and the line hangs up!!!

This lady call me a few times when i answered she was very aggressive tone of voice i ask who was calling and she did not want to say it. so i hang up.

I just got a call a minute ago from (561) 807-0240 Caller id Sunrocket DID  ??.. they asked for my name .. so i did tell them that this was a company number and ask the lady , what company they were calling from ?. she reply by saying , we are sorry , we must have the wrong number..  :-s and hang up. so no idea..

This is the second number this SunRocket DID keeps calling from.  They never leave msgs.