Tickets are like vouchers. If they are lost or stolen no replacement ticket can be issued (risk of abuse).
However, if you have booked a clearly identifiable seat, please contact our customer service at kundenservice@wien-ticket-service.at or call +43/1/58885-111 (weekdays from  9 A.M to 5 P.M). We will contact the event organizer and try to find a goodwill solution. Please understand that any goodwill solution depends only on the judgemen tof the organizer and WIEN-TICKET has no influence on it.