new customer? That's because we charge for your 'first month's package' and 'next month's package' together on the first bill. Don't worry, this only happens when you first join us or have just moved home - your bill settles down after that.
When you get your first bill you should also look out for one-off charges, such as installation or movers fees. These appear in the 'Other fees, charges & credits' section of your bill.