Identity theft scam?

What would you do if you received two letters from a collection agency saying that you owed $5,000 to a firm with whom you've never had an account with? I ignored it and the following letter, immediately smelling a rat. What would you do further, if you got a call from that agency, and you told them that you had never heard of them, and that you had never had an account with the firm? I told them to go to hell. And then they asked if I was willing to just verify some information. Like the last 4 digits of my social security number. I told them, even more forcefully, to go to hell. And then they asked whether I would be willing to confirm the last 4 digits if they read them to me? I told them again to go away telling them I definitely smelled a rat and thought this was some kind of identity theft scam. He pointed out that he wasn't asking me for any information, simply that I confirm information that he was giving me. Four simple digits. What would you do? Technorati Tags: interesting