Hi @Johnnylad, thanks for your reply.
Please don't worry about this, as your final bill will never be produced before your disconnection has occurred - that may just be your final payment to us.
There will be one more bill generated which should reach you soon, and this will reflect the actual disconnection date and any potential refunds you are owed too.
Please let me know when you receive this, if you have any further questions.
Many thanks
Tom_W