Well the ones I ordered are still showing at £20 so if it *was* a mistake, surely they knew and would have corrected by now?
Depends on the mistake, their systems and how quickly they can rectify this through the Amazon marketplace tools. All the same, I would have expected them at the very least to start pulling things from the marketplace to reduce the damage.
Could also be they don’t know yet. Maybe the stock alert systems, which would show anomalies in order patterns, they have on their own backend doesn’t work with stuff being sold through Amazon. So it could just be getting packed up and sent out by workers who just do what the tickets coming down tell them.