I received a phone call from this number and asked me if I was ok. then hang out and when I called back it was a voice message. for me is very suspicious.

Rang, left no message.  3/6/17 1:50 pm

Called my cell phone at 5:43PM.  The caller is a recorded robocall that answers your hello with something like hello, I'm having headset problems.  I have received this same call from different numbers.  There is no way to block the calls because each one is showing a different caller ID.  When you answer, just listen and do not respond, then hang up.  You will get called again sometime, but with a different number.  I called the number back and got a recording that stated "thanks for calling, the survey you are calling about is now closed"  then some other babble so I hung up.

Caller said her name was Emily. She was talking to her husband and asked if I was still there.