I had similar email saying CC did not go through and were asking for a bank transfer or a cheque payment. They also ask cheque to be sent to a PO BOX and not their office address.
Do not go for this lame excuse check with your CC company first if there is any problem. Insist to pay by CC. You are protected if you pay by CC but bank transfer can never be recovered.
Best option is pay £10 extra and avoid losing everything
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