Lots of if's there. They won't win, and they know it (which is why these court cases don't happen). They'd have to prove their decision to refund the buyer was sound and because they don't give a toss and always side in favour of the buyer they would lack this concrete evidence that a court requires over their sham of a dispute process.
All they have to show is that they followed the T&Cs you agreed to when you decided to sell on their website. There aren't any laws governing this. You aren't a buyer protected by consumer laws.
This is a contractual dispute.
There is only one if here and that is whether they take you to court over £2.5k.
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