Cannot verify or remove card payment info
I have hit against an unusual problem, due to an iCloud payment being declined. I have contacted my bank who confirm it is a merchant technical issue, my credit card is otherwise working fine.
However, I cannot add another payment method because I get error:
Payment Verification - One or more of your payment methods require verification
At the same time, I cannot verify the existing card, because I get message:-
Your Credit Card was declined, go to the iTunes Store...
I cannot remove the card, as I get the error message:-
Unable to Remove - Family Organiser requires at least one payment on file
So I am totally stuck!
Please help!
Regards
iMac 21.5", macOS 10.14