I got an email saying my latest internet bill is overdue, despite having direct debit enabled. I double checked in My Account, and all my direct debit details are there. I ended up paying this bill manually, but why wouldn't direct debit be working? (There was enough money in the account so it's not that) I don't want to have to worry about this every month...
Did you only recently set up Direct Debit? If you had set it up after the most recent bill had been issued, it would have had to been paid manually as you have since done.
If previous bills have been paid with Direct Debit and then this one mysteriously didn't that is odd, let us know if it happens again next month.