I got a call from a collector at this on also. They are so tricky. They use numbers like this to trick you into answering because they know everyone screens out the 800 and blocked numbers. I have a 440 number so they use this as the ID. Then they call me at my business line and I pick up because I think it is a client.
I spoke with someone at this number, I was at work with a client when they called. They immediately asked me what the last four digits of my social security number, when I made a statement like "Who is this?" they immediately hung up.