When it's an NTL bill!
Last month I added itemised billing to my service, so I could bill all those small calls back to the company on expenses.
Made absolutely no difference to the printed bill
I still get "11 Non-itemised calls under 20p" even though there is a £1 charge for fully itemised bill
Call centre lady was at a lost to explain so I gave up and said take off the itemised billing charge
C'est la NTL vie