REMEMBER: IT IS YOUR RIGHT TO CANCEL CONTINUOUS PAYMENT AUTHORITIES DIRECTLY WITH YOUR CARD ISSUER
But wether or not Monzo can “see” the CPA - is irrelevant - you have the right to stop the payment.
All of this of course made harder by the fact that they are a US based provider - and so the advice of “VPN” and “Cancel your card” are probably the best here.
It of course won’t change your legal obligations.
Edit: Whoops didn’t realise the original problem is a week old now!