You may want to show a bit more of the Notice to Keeper (NtK). However, even if this goes all the way to a court claim, which is likely, you won't be paying a penny to UKPC because any claim, as long as it is defended, will be discontinued.
So, show us a bit more of the NtK and we can provide the necessary appeals, which are likely to be rejected and advise on how to avoid paying anything to this operator.