NTL bill double for broadband

Ok, it’s not quite as bad as the title makes out.. well actually, yes, I guess it is.
Just had the NTL bill through for this month and it’s about 50% more than normal – the reason for this is that they’ve decided to go from billing 1 month in arrears for broadband to 1 month in advance the same as the phoneline rental. I can see there’s a certain logic to this, but doing it without any warning (that I saw anyway) and charging both months in the one bill is a bit much. It would have been better, although perhaps a little more complicated at their end, if they’d split the extra months payment across two months, going 2 weeks in advance the first month and then the full month in advance after that.