Struck me as a scam not a legit collection. Got a...

Struck me as a scam not a legit collection. Got a phone call from a pissed off male saying my wife owes $$$ for something. I asked him to send me all information pertaining to the "bill" including original creditor so I know this is not a scam. I said as far as I know this is just some guy calling me saying my wife owes $$$ pay me now! He said it will take time. A week later I called back and the frustrated individual said the information still needs more time. At this point I figured this is just a scam. That was about 3 years ago and to this day my wife's credit report shows the "bill" but I am hesitant whatsoever to make any payment to these guys. It seems very shady and illegitimate. Never heard back from anybody.