A: Hello, is this the Smith residence? B: Yes it is, may I ask who is calling? A: This is your bank calling in regards to an overcharge on your credit card. B: I'm sorry, there must be some mistake. A: It says here that you charged over $500 on it yesterday. B: That can't be right; I have not used it in months! A: Are you saying you did not make that charge? B: That's exactly what I am saying. A: Looking closer, this charge was made in a different city. B: I am looking for my card now and I cannot find it. A: This calls for further investigation. B: I assure you I did not make the purchase.