I am sorry to hear that but but you just gotta suck it up, pay the fees and move on. An honest mistake is still a mistake on your end, not the airline's. The 24-hour window after purchase could have allowed you to get it fixed but too late now I guess. This is also why I double, tripe check all the details of the ticket right after paying for them. Anyway, it won't hurt if you will try again so good luck!