I'm sorry your having a problems with your BT TV service. The error message "Error codes BTP-15000/ BTP-15990" usually indicates a mis-match some where with your account information and the network. I'll be able to get this corrected.
Please can you send me in your details using the "Contact The Mods" link found in my profile.
@Jmccay I'm really sorry this is not sorted, unfortunately the Moderation team are unable to help with your case as you have a FTTP line but I can see you have case handler who is working on this so I've emailed him requesting that he gets back in touch with you.