I am getting calls from this phone #. Someone knows who they are?

Getting calls from this number don't answer

getting call from this # no answer

I got a call from this number and called back using another phone line.  The woman I spoke to told me she was a debt collector but wouldn't give me any information unless I gave her my social security number!  I don't have any debt so I'm concerned that it's not legitimate.  Be careful!

I never picked up, but read the reply's for this number and it is a collection agency, but I don't know for what or who.