Welcome to the forum and thanks for posting. Sorry you're having problems with the BT Sports service. You've mentioned going through the online help but can you double chack 'IPC' error codes on YouView and let me know if it helps. If you're still having problems after that drop me an email with your details and I'll take a look for you.
If you click on Davids or my forum profile you'll see a 'contact the mods' link that you can use to send over your details.