According to the Viagogo FAQ page, you should receive your tickets in the week leading up to the event. The reason is that most event organizers issue tickets close to the event date, frequently, the week of the event.
If you are travelling to the event, you should add your travel address and expected departure date so that Viagogo can ship your tickets to the right place.
If you still need any assistance, you may try to reach out to Viagogo Customer Care by phone at (866) 961-3071 or by email at customerservice@orders.viagogo.com and provide them with full details regarding your issue.