called number back did not understand how they answered accented voice wanted to know if I just received call

Received call from this number with blocked name as caller ID.  I don't answer those.

Received several calls from this number asking for a person that I have never heard of. I get several calls from 800 numbers and unknown numbers asking for this same person. I have asked these people to remove my number from their call list because at this point it has become very frustrating. These people are harrassing me now. They are calling my cell phone and they call while I am at work, in school and at home. It is very annoying and I am ready to start filing complaints against them. I have tried to speak with them on a very nice and professional level to let them know that they have the wrong number and to please remove my number from their call list but they continue to call. They are forcing me to involve my attorney! I'm fed up!