In reply to JoshOvki:
I had similar "demands" from Swansea council and thought similar to you. I asked the lady about it when I phoned to set up the dd and she said that the letters were written to make it clear to even the biggest idiot that something needed to be paid.
She was very polite and efficient setting up the payment although the system has been less efficient at sorting out my single occupancy discount now I'm single.
And don't get me started on why I only get a 25% discount!