Hi BTKMLondon and thanks for your post.
I'm very sorry to hear your installation didn't happen without a hitch.
I'd like to help get this sorted out for you so I'll drop you a private message shortly. Just click the small envelope icon to the top right.
Need help changing SIM card? Find out more about activating your 4G ready SIM. 4G SIM Swap Help
Just wondering if you still need help with this as I haven't heard back from you. If so, please get back to me with the information requested in my private message.