Who called from 2108532632

I received a couple phone calls from this number asking if I was Susan Carlson.. They asked if I was available I said I was they do not know if I was at home or work. I do not know who this color is and I do run a business so I just answer the question

Keeps calling and hanging up when I answer.

I keep receiving calls also.  When I answer they hang up!

they call and when I pick up no answer then when I call them back they don't answer

Annoying calls they will not stop...help