Who called from 4805258028

It is a collection agency called GMC, Glass Mountain Capital. out of IL. They aslo claim to be Elpin and Elpin atty's at law

If they're an IL company why do they have an AZ numbe? Number called while I was at work but left no message.

Received call.  said he was recording me and asked if I was a certain person and read off a last four of social and address, asked if I was a government employee and asked if it was mine??  He said I just want to make sure its the right person. I said you obviously have the wrong person. This number has appeared on my caller id several times