Welcome to the Community Forum and thanks for your post. I'm sorry that you haven't received confirmation of your iPhone 7 pre-order request. Have you received the confirmation now? Currently, there is a delay in the iPhone 7 orders due to high demand.
If you would like for us to check this, please contact us on 0345 6000 789, as AlexKid advised.
Need help changing SIM card? Find out more about activating your 4G ready SIM. 4G SIM Swap Help