In January, I tried to order packages at Orbitz from Boston to Cancun. At first, the payment did not go through, due to some incorrect payment information, but I still had the amount of 2 flight tickets pending in my account. Orbitz customer service told me the amount would be cancelled in few days.
Today, I was charged by my bank for the amount of only 1 flight ticket. The reason bank gave me is that their records showed I took a flight (which I even didn't know about).
In this case, how can I prove that I didn't take that flight?