Davidm explained on 30/08/2020 :
If you sign in (uses licence number, surname and postcode) you should
be able to see, and change, how they think you are paying.
https://www.tvlicensing.co.uk/cs/update/your-licence

I would rather ring them up and complain, but I have just realised its
a bank holiday tomorrow, so no one answering.