If you have a confirmation/order number but have not yet received a confirmation email, there is no need to worry. The fact that you have an order number signifies the booking has been successful.
Please check the email address given is spelt correctly as this can lead to failure in receiving your confirmation email. Remember the ticket will come from the ticket agent for that event, not Live Nation.
Please allow up to 72 hours for your order confirmation to arrive. If after this time you still have not received anything, please contact the ticket agent.