Crazy mix up happens way more often then anyone realizes until it happens to them. Any number of careless record keeping even a transposed number can cause money woes and stress to an innocent person. And it's the innocent person that is the victim, no one wants to believe or take the time to find out what's wrong. It's easier to dismiss the problem. Don't give up, make a pest of yourself until you find out why. Make a police report and keep on insisting you want answers, not later but now.