Billing Problem email

I received an email stating: "Billing Problem. There is a problem with your payment method that may prevent the renewal of this subscription".

There is not enough information in this email, or discoverable on my device or itunes or apple support to understand what the issue was, where it occurred, what the date of the transaction was, etc.

There is no problem with my card / payment method, since two payments to Apple were processed already this month, as confirmed by my bank. The card is years away from expiring.

I am not able to see the expiry date of the payment method on file, is case this is the problem. Apple will not allow me to update the card details (as the card is already on file) or delete the card and re-add it (as it forces me to have a valid payment method on file - even though it thinks this card is not valid).

So I am at a loss here. There is nothing I can do, or in fact need to do, to fix a problem which Apple understands but is failing to provide me with sufficient information or means to fix. This is entirely Apples problem, it would be nice for Apple to fix this and the failings listed above, and inform me when they have successfully done so.