This is one of many 9 or 10 numbers this collection agency uses.  They buy old internet payday loan defaults.  It is a robocall and will only have a live person if you answer the call.  They are very abusive and threaten you.  Block them.  They do not care if they have the wrong number.  If they have your number, you are guilty in their book.  They will continue to call no matter what you tell them.