4 sign to identify that the collection agency is a scam or genuine

Getting a debt collection call regarding the payment you never paid is a common thing. But what if you don’t recognize the person who is calling you or the debt he is talking about. So, before apologizing and promising any debt payment, think of another scenario: It's not your debt at all or might be it’s a spam call or it could be the case of “tagging” where the person follows the wrong person for the collection.