Payment for what? Broadband?
Your 12 month discounted rate came to an end? As the 12 month rate is not for life.
Can you please post the affected three monthly payment amounts, plus the amount you were paying prior to these changes?
But at a guess, it’s the £3.50 increase Now emailed all its broadband users about - are you still using/monitoring the email address you have to Now?
Then the expiry of an £8 discount.
And finally the expiry of a £13 discount.
Does that fit?