Hi Aitches,
Welcome to our Community and thanks for posting. I am sorry that we have kept you waiting for a reply.
I am afraid that a completed payment cannot be cancelled. If you made the payment by mistake the best thing you can do is to contact the seller, explain the situation and ask them to refund the payment back to you. You can contact t6he seller thorough his website or through the email address that you can find in the transaction history.
I hope this information helps and that you got or will get a refund.
Dian
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