It's simply establishing a billing cycle, @Imgroot.
You are paying for the NEXT month PLUS THE DAYS OF SERVICE UP TO the date they made up the bill.
All should be clear if you take a look in the details in My Account.
Also here:
https://community.talktalk.co.uk/t5/Articles/Your-first-bill/ta-p/2204666
Gliwmaeden2, a fellow customer.
From the 29th of March our TalkTalk Community will move to peer-to-peer support and the TalkTalk team will no longer be here to support with queries. Don’t worry we still have plenty of ways to reach out if you need to speak to TalkTalk directly. For more details check out the link in the post at the top of any forum message board.
