Been there dunnit got the t-shirt.
however -
For reference when sending your £20 use "2020XXXX" (2020 + your Club Membership Number) on the Club member area forum.
please ensure you use reference number 2021XXXX (2021 + your Club Membership Number) on your email.
So I changed my bank payment detail from 2020 to 2021 - which involved 3 security checks and a call from santander.
(think it is time to change banks)