There's a link to the old site at the bottom of the home page of the new site
Long story short, after paying for the order on the old site, it is now showing my order as cancelled
As mentioned in my original post, this is the problem I want addressed...
My order has been paid for (on the old site), and now the order status is showing as 'Cancelled'. So from my perspective, Minersource have taken my payment and cancelled the order.