Talktalk charges the full month ahead in case you change your mind, @Hethtee.
They don't know the exact date of the switch till it has actually happened. Unused days are refunded in a subsequent bill.
You then claim back the refund from My Account using the same direct debit details as for normal billing, so don't remove these yet.
I'll move this to the billing section for further clarification from staff.
Gliwmaeden2, a fellow customer.
