If it is for a subscription. New subscriptions are closed and existing ones have been wound down, so there should be nothing further to charge. If a subscription of yours was never cancelled, you can change the card yourself at dashboard.circuitmess.com. Log in with your account email, open the Payment method section and click Update. There are step-by-step instructions in "How do I add or update my payment info?"
If the dashboard will not let you do it, message us here, or email [email protected], with your account email and we will sort it out with you. Please do not put card numbers, expiry dates or security codes in an email. We never ask for those and we cannot accept them that way — you always enter them yourself.
If it is for an order you have already placed. The payment method on a placed order cannot be edited, because the payment is authorised at checkout. While the order has not been dispatched we can cancel it for you and you can reorder with the card you want to use. Message us here with your order number and we will stop it — see "Cancelling before your order is dispatched".
Once the parcel is with the courier we cannot recall it. You can still return it for a refund once it arrives, and you do not have to wait for it to reach you to tell us — message us here as soon as you decide and your refund runs from that day. The full rules are in "What is CircuitMess' refund policy?"