I'm not sure I understand what's going on with our billing, we have the phone account and the BB account that I understand are merging. However the most recent BB bill we have is for 3 months, 9th June to 8th September. Which is odd for a start as we pay monthly, and always have! Now this amount has been taken from our account by direct debit and we have a further bill that includes phone and the BB for 9th July until 8th August.
Now to me it looks like we're paying twice for our BB now, but this merging of accounts matched with the difficulties using the my account section of the BT site to get past bills etc has made this very difficult to work out. Not helped that we had problems with our line rental not being billed for about 9 months which was only resolved recently.