I get too many disputes denied when I have obvious recordings of leads already booked calling back. I get a response as soon as I hit send in most cases. The phone recordings can't play any part in the dispute process. I have recordings of clients calling up to cancel appointments, reconfirm appointments, and/or explicitly state they're calling back and these get denied almost 100%. Most other situations seem to be approved pretty well but the clients calling back, especially on another number, are tough to take. $40-50 to get the lead and another $40-50 to have them call back and cancel.