Is this a collection agency or a wrong call?

I have been called by this company several times in the last month. The first time I answered and they asked if I used to live at some address in another city. I told them no. The guy I spoke with was very rude about it. I called them back to see what company it was and they wouldn't say unless I gave them my phone number. They just left a voicemail without calling me first. Seems really fishy to me.

called ...then hung up. ( i didn't answer ) no v.mail

received call from this #.  No info.