As stated in our general terms and conditions, we do not take back tickets that have been sold.
The right of renunciation does not apply because the service, c.q. the reservation of tickets, is provided immediately.
For a small additional fee per ticket you can take out cancellation insurance for your entire reservation. If you are faced with a setback just before the event and are unable to attend, this insurance will refund your tickets. In such a case, contact the insurer directly and be sure to give them your reservation number. For the reimbursement, the insurer will ask you to provide all relevant evidence or documents.