<prompt> Human: My girlfriend bought us concert tickets for Christmas from tickets-center.com by mistake. Something came up however and we can no longer attend the concert so we went to put up the tickets on stub-hub. However, when we tried to, stub hub said that the ticket numbers were already registered for sale and that we cant post them. We called her bank to attempt a chargeback, but theyre refusing to do it because she purchased the tickets herself. We attempted to contact the vendor, but they arent answering calls they dont have any human reps, and havent answered the email yet. Any advice? Thanks!  <response>: Unfortunately you dont have evidence for your bank that the tickets are worthless. They could still get you in the door, you are just prevented right now from reselling them. You need to contact the original issuer - Ticketmaster or whoever that may be, and request a letter stating your tickets are invalid. If this doesnt work, have a friend take the tix to the venue on show night and get turned away. I work in a box office and when this situation happens we have an official letter we give them to assist in getting a charge back. If they dont have one, get phone numbersemails for the box office management and request a letter explaining that you were turned away due to invalid tix. 